Why, in an era obsessed with human optimization, supplements, and bio-hacking protocols, does the most fundamental aspect of human performance remain the most overlooked?

Sleep is not extravagant. It doesn’t arrive in a supplement bottle with a flashy label, and it won’t generate impressive social media content. Yet it governs everything about performance – your training, your recovery, your mental health, your decision-making, your hormones, your ability to handle stress.

Brian Johnson, who has invested millions into hacking every aspect of human performance, ranks sleep as the number one optimization above all else. Not supplements. Not cold plunges. Not the latest bio-hacking equipment.

Sleep.

It’s the lowest hanging of all “optimising” fruit you can pick.

Over the last 5 years, there has been a cultural shift away from the “hustle and grind” mentality, and the new understanding is clear: sustainable power, wealth, and success emerge from recovery, not from relentless grinding. Sleep is the foundation upon which everything else is built – whether you’re an athlete, a parent, a business owner, or simply someone committed to living better.

Definitions

Sleep is a recurring state of reduced consciousness and metabolic activity characterized by altered awareness, inhibited sensory activity, reduced muscle activity, and decreased interactions with surroundings. It occurs in cycles; transitioning between non-REM (rapid eye movement) and REM sleep, each serving distinct physiological and psychological functions. Before examining the mechanisms of sleep, let’s understand three interconnected concepts often used when discussing rest and recovery:

Circadian Rhythm: Your body’s internal twenty-four-hour clock, governed primarily by light exposure, which regulates sleep-wake cycles, hormone release, body temperature, and other physiological processes.

Sleep Architecture: The structure and pattern of sleep stages throughout the night, including the cycles between non-REM and REM sleep.

Sleep Pressure: The biological drive to sleep that accumulates during waking hours through the buildup of adenosine the byproduct of cellular energy metabolism.

Once these three ideas are established, you can comprehend how they combine to encourage restorative sleep, understand the impact of disruptions across these systems, and recognize the profound effect poor sleep has on performing at your best.

Why Sleep Matters

Dr. Matt Walker, one of the world’s leading sleep researchers, points out something profound: his team has not found a single major mental health disorder where sleep is consistently good. Depression, anxiety, bipolar disorder, post-traumatic stress disorder – all share one common thread: disrupted sleep.

Sleep is a stabilizing force, it regulates mood, buffers stress, and helps you weather the challenges of daily life. Without it, you become fragile – emotionally, mentally, and physically.

Studies examining reactions to the pandemic showed that people with consistent sleep patterns demonstrated significantly greater ability to handle stressors, experiencing less anxiety, better emotional regulation, and faster recovery from setbacks.

Sleep consistency is one of the most protective factors for both mental and physical resilience, particularly when life becomes difficult.

You’re Not Overtrained, You’re Under-Recovered

Most athletes training in Jiu Jitsu don’t need less work. They need more sleep.

One night of less than six hours sleep reportedly causes testosterone levels to drop by up to 11%, IGF-1 (or growth hormone production) to diminish, and cortisol levels to elevate significantly.

Sleep is when your body repairs itself: ninety-five percent of growth hormone is produced during sleep, during sleep memories are consolidated, the days damage is undone; metabolic waste, stress hormones, and the neural fatigue you accumulate during the day are all reset during sleep.

During waking hours, you accumulate stress. During sleep, you recover from it.

If you’re training hard but sleeping poorly, you’re not optimizing performance. You’re running a deficit that will eventually manifest as injury, illness, or burnout; your body doesn’t distinguish between physical, mental, or emotional stress – it simply knows it needs time to recover, and that time is sleep.

Jiu Jitsu and Sleep: A Reciprocal Relationship

Jiu Jitsu can be an excellent tool for sleep – or a terrible one, depending on how you manage it.

On the positive side, exercise increases adenosine buildup, which creates sleep pressure.

Physical exertion reduces stress and anxiety in most cases, and regular training helps regulate circadian rhythm. The physical demands of grappling break down ATP (adenosine triphosphate), your body’s energy currency, which releases adenosine as a byproduct, signalling to your brain that rest is needed.

However, there’s a darker side.

Have you ever found it harder to fall asleep after a late night training session?

Late-night training spikes cortisol, making it harder to fall asleep.

Maybe you’ve ingested some caffeine (pre-workout) before that session? Well, high caffeine intake before training blocks your adenosine receptors, disrupting natural sleep pressure – over-training without adequate recovery creates chronic sleep debt that compounds over time, leading to injury, burnout, and stalled progress.

The key for best training and any caffeine intake to maximise the benefit, lies in timing, managing your intensity, and any recovery protocols. Training at consistent times, managing caffeine intake strategically, and implementing wind-down routines after evening sessions can transform Jiu Jitsu from a sleep disruptor into a sleep enhancer.

The Mechanisms of Sleep

Sleep is governed by two primary forces. Understanding these mechanisms allows you to manipulate them intentionally.

Adenosine: The Sleep Pressure System

Adenosine is a chemical messenger that creates what researchers call “sleep pressure” – the biological urge to sleep. It’s a byproduct of ATP, the energy molecule your cells use for all metabolic processes. The longer you remain awake, the more adenosine accumulates in your brain, gradually increasing your desire to sleep – when you finally rest, adenosine levels drop, resetting the system for the next day.

As previously mentioned, caffeine functions by blocking the adenosine receptors in your brain, which is why it keeps you alert. However, adenosine continues building up behind the scenes, and once caffeine’s effects wear off, all that accumulated adenosine hits at once, resulting in what’s commonly known as “the crash.” This is why timing your caffeine intake matters – it’s not merely about staying awake, but managing the rebound effect that inevitably follows.

Circadian Rhythm: The Internal Clock

Your circadian rhythm is your body’s internal twenty-four-hour clock, governed primarily by light exposure. Morning light, especially sunlight, triggers cortisol release, signalling wakefulness and setting a biological timer for when melatonin will be released later, roughly twelve to fourteen hours afterward.

Evening light, especially artificial blue light from screens, disrupts melatonin release, making it harder to fall asleep.

Sleep Architecture: The Nightly Cycle

Your circadian rhythm determines when you feel sleepy. Adenosine determines how sleepy you feel, and both need alignment for optimal sleep. When they’re out of sync – for instance, when you’re exposed to bright light late at night while your adenosine levels are high – you feel simultaneously wired and tired – the body wants to sleep, but your brain receives conflicting signals.

It’s worth emphasising here that sleep is not a single uniform state, it’s a dynamic cycle between non-REM (Rapid Eye Movement) sleep and REM sleep, each serving distinct functions.

Non-REM sleep consists of four stages. Stages one and two are light sleep, transitional phases where your body begins to relax and brain waves slow. Stages three and four are deep sleep, the most physically restorative phase. During deep sleep, powerful brain waves wash across your cortex from front to back, clearing metabolic waste and consolidating memories. This is where physical recovery occurs – growth hormone is released, muscles repair, and inflammation reduces.

REM sleep is characterized by rapid horizontal eye movement beneath the eyelids. Your brain becomes highly active during REM sleep, sometimes more active than when you’re awake, yet your body experiences muscle atonia – temporary paralysis that prevents you from acting out dreams. REM sleep is critical for emotional regulation, creativity, problem-solving, and testosterone release. It’s also where the brain processes and integrates emotional experiences from the day.

Your brain cycles between non-REM and REM sleep approximately every ninety minutes throughout the night. Early in the night, you experience more deep non-REM sleep and less REM, whereas later in the night, the balance shifts – more REM sleep, less deep sleep. This is why cutting your sleep short by even two hours can be disproportionately costly. You’re not just losing two hours – you could be losing fifty percent or more of your REM sleep, which concentrates in the final third of the night.

This is also why extending sleep before a competition, seminar, or high-demand period can be valuable. Studies on NBA players who extended their sleep showed measurable improvements in shooting accuracy and reaction time. The additional REM sleep improved their decision-making and motor coordination under pressure.

Sleep Consistency: The Critical Metric

Emily Capodilupo, Vice President of Data Science at WHOOP, has demonstrated through millions of data points that sleep consistency is more important than total sleep duration for long-term health and performance.

When you sleep at consistent times, your body can anticipate and prepare. It knows when to release hormones, when to prepare digestive enzymes, when to regulate blood sugar. If you eat the same meal at the same time every day, your body releases insulin ahead of schedule, keeping blood sugar more stable.

If you train at consistent times, your body also pre-allocates recovery resources more efficiently – your circadian rhythm is essentially a predictive system that anticipates what’s coming based on patterns you establish over time. However, if you hold onto erratic sleep schedules, maybe chatting late after class or watching Jiu Jitsu into the early hours, you are disrupting this anticipation and your body’s planning.

Your body constantly plays catch-up, leading to higher blood sugar spikes, poor recovery, increased injury risk, and decreased ability to handle stress. Even a thirty-minute variation in your sleep-wake schedule can cause a forty-two percent increase in abnormal heart rate variability, a marker of physiological stress.

How Much Sleep Do You Actually Need?

The literature suggests seven to nine hours as the target for most adults. Less than eight hours shows a potential increase in all-cause mortality. More than nine hours also shows a potential increase, though this is often due to underlying chronic conditions like depression or disease.

However, duration is not the hero metric. Focus on consistency and quality first, then optimize duration. People often obsess over hitting a specific number of hours, but what matters more is how you feel upon waking. Are you groggy and unrested, or do you feel clear and ready? Are you relying on caffeine to navigate the morning, or do you possess natural energy? These subjective markers, combined with objective data like heart rate variability, are better indicators of sleep quality than total time in bed.

Recovery Debt: The Two-Day Rule

For every night of sleep loss, it takes two days of full recovery to return to baseline. If you lose sleep Friday and Saturday, you’re not back to normal until Wednesday. This is why chronic sleep restriction is so damaging – you never catch up. You’re perpetually operating in a deficit and the body doesn’t forgive sleep debt easily.

You cannot “make up” for a week of poor sleep with one extended night. Sleep is not a bank account where you can overdraft and then deposit later. It’s more like a daily biological reset button. Miss the reset, and you begin the next day already compromised.

Using Your Natural Rhythmn

Your body operates on a ninety-minute ultradian cycle throughout both day and night. This shorter cycle governs focus, energy, and alertness during waking hours, and sleep architecture during the night.

During the day, you move through ninety-minute cycles of high focus and low focus. You sit down to work, you’re sharp for an hour or so, then your attention begins to drift. You yawn. You feel restless. This isn’t laziness – it’s your ultradian rhythm signalling a natural dip.

The same pattern governs your sleep cycles at night.

At night, you experience roughly five and a half ninety-minute sleep cycles, if you’re getting a full eight hours of sleep. Each cycle moves through the stages of non-REM and REM sleep. The key insight is that your body prepares for sleep at the end of each ninety-minute cycle. You yawn. Your body temperature drops slightly. Your attention fades. This is your body signalling readiness to transition – if you can identify when these natural dips occur, you can time your bedtime to align with them.

Most people yawn every ninety minutes or so. Pay attention to this pattern. If you notice yourself yawning around ten-fifteen in the evening, that’s your body signalling the end of a cycle. Retire five minutes before that moment. Don’t push through it. Don’t wait until you’re exhausted.

By going to bed just before the dip, you work with your biology rather than against it. You’ll fall asleep faster, and your sleep will be deeper because you’re entering the cycle at the optimal moment. If you miss the dip and stay awake, you’ll have to wait another ninety minutes for the next opportunity. This is why some nights you lie in bed wide awake for an hour – you’ve missed your window.

The same principle applies to waking. If you wake at the peak of a ninety-minute cycle – roughly forty-five minutes into the cycle – you’ll feel groggy, disoriented, and unrested. This is sleep inertia, and it occurs when you’re pulled from deep sleep or REM sleep before the cycle completes. But if you wake at the end of a cycle, during the lighter stages of non-REM sleep, you’ll feel alert and refreshed.

To optimize this, calculate your wake time in ninety-minute increments from your bedtime. If you need to wake at six-thirty in the morning, count backward in ninety-minute blocks. Most people find better results aiming for seven and a half or nine hours of sleep rather than eight.

Consistency, however, matters more than perfection.

Optimizing Sleep: Practical Protocols

Light Exposure: The Master Regulator

Light is the most powerful lever you have for regulating your circadian rhythm. Your eyes contain specialized cells called melanopsin cells that detect light and communicate directly with the suprachiasmatic nucleus, the part of your brain that controls your circadian clock. These cells are particularly sensitive to blue light, which is abundant in both sunlight and artificial screens.

In the morning, within the first zero to two hours after waking, obtain at least ten minutes of natural sunlight. This doesn’t mean staring at the sun – it means being outside without sunglasses, allowing light to reach your retina. This triggers cortisol release and sets your circadian clock, telling your body “this is the beginning of the day.”

Train earlier in the morning? Use the light exposure to start the countdown to a better nights sleep.

In the evening, viewing sunset signals your body that sleep is approaching. Even brief five-minute exposure to sunset activates melanopsin cells in your retina, which protect your circadian system against artificial light later. Your body evolved to synchronize with the sun, so hen you remove that signal, your internal clock drifts.

After eight in the evening, dim all lights. Avoid bright screens, especially between eleven at night and four in the morning, when light exposure is most damaging. During this window, light suppresses dopamine, inhibits learning, and activates the habenula – sometimes called the “disappointment nucleus” of the brain – leading to mood disruption and increased risk of depression. The longer you’re awake, the more sensitive your eyes become to light. This makes it progressively harder to fall asleep the later it gets. Your melanopsin cells ramp up their sensitivity as adenosine builds, so even dim light late at night can have an outsized effect on melatonin suppression.

As much light as possible early in the day. As little as possible after eight in the evening. This intervention is free, accessible, and among the most powerful changes you can make.

Temperature: Core Cooling for Sleep Onset

To fall asleep, your core body temperature needs to drop by approximately 1°C Celsius. This is non-negotiable, and your body will not initiate sleep unless this drop occurs. Optimally, our sleep temperature is 16-18°C (60-65°F), yet most people sleep in rooms that are far too warm – if you’re waking in the middle of the night, overheating is often the culprit.

Here’s the counter-intuitive approach: you can accelerate core cooling by warming your extremities. Wearing socks or using a hot water bottle on your feet or hands dilates the blood vessels in those areas, pulling heat away from your core. This is local warming versus global warming – you’re manipulating blood flow to drop core temperature faster.

Similarly, taking a hot shower or spending time in a sauna sixty to ninety minutes before bed raises your core temperature temporarily. When you exit, your body over-corrects and cools down more than it would have otherwise. This is why many people feel sleepy after a hot bath – it’s not the relaxation, it’s the temperature drop.

Environment: Creating the Cave

Sleep in a completely dark room. Blackout curtains, eye masks, whatever is necessary. Even small amounts of light – like the glow from a phone charger or streetlight through the window – can disrupt melatonin production. Your skin also contains light-sensitive cells, so it’s not merely about covering your eyes.

Minimize noise. If you live in a noisy environment, use earplugs or a white noise machine. Brown noise and pink noise are also effective for masking disruptive sounds, the goal is to create a cave-like environment – cool, dark, and quiet.

This is the environment your body evolved to sleep in.

Food Timing: The Feeding Clock

Stop eating one to two hours before bed, digestion raises core body temperature, making it harder to fall asleep – high blood glucose at night disrupts sleep architecture, particularly REM sleep.

Your body possesses what’s called a feeding clock, separate from but linked to your circadian clock. When you eat signals to your body what time of day it is. Eating late at night confuses this clock and pulls your circadian rhythm out of alignment.

Lower carbohydrates and higher fat at night may keep you fuller longer and stabilize blood sugar. Avoid high-glycemic foods before bed, and if hunger is keeping you awake and you need a bedtime snack, choose options like Greek yogurt, walnuts, raspberries, kiwi, cashews, or warm milk. These are low-glycemic and contain sleep-supporting nutrients like magnesium, tryptophan, and melatonin precursors.

Caffeine: Understanding the Half-Life

Caffeine has a half-life of five to six hours and a quarter-life of ten to twelve hours. This means if you consume coffee at two in the afternoon, twenty-five percent of the caffeine remains in your system at midnight.

Caffeine affects sleep in three ways: it makes falling asleep harder by blocking adenosine receptors, it increases the frequency of nighttime waking, and most insidiously, it decreases the depth of deep sleep – the most restorative stage. Even if you “feel fine” and fall asleep after late-day caffeine, your sleep architecture is compromised. You’ll wake feeling unrested, wondering why you’re still tired after eight hours in bed.

Cut caffeine ten to twelve hours before bed. For most people, this means no caffeine after noon. If you love the ritual, switch to decaf in the afternoon. The antioxidants in coffee are valuable – they protect against Alzheimer’s, diabetes, cancer, stroke, and depression – but you obtain those benefits without the caffeine.

Alcohol: The REM Sleep Destroyer

Alcohol might help you fall asleep, but it destroys sleep quality. It blocks REM sleep, which is critical for emotional regulation, creativity, and testosterone release. It increases waking frequency. And it competes with light receptors in your circadian clock, blocking melatonin release.

There’s also the REM rebound effect. Once your liver clears the alcohol, usually in the second half of the night, your body attempts to “catch up” on lost REM sleep. This is why you experience vivid, chaotic dreams after drinking. Your brain desperately tries to recover the REM it missed, but it cannot fully succeed. You wake unrested – avoid alcohol within three to four hours of bed – if you drink, accept that your sleep will be compromised.

Training Late at Night: Managing the Response

Late-night training can disrupt sleep through three mechanisms: core body temperature increases when it needs to drop, cortisol spikes and stimulates wakefulness, and light exposure in the gym disrupts melatonin release.

The optimal practice is to stop training three to four hours before bed. If you must train late, minimize bright light exposure afterward. Dim the lights in the car and at home. Use cooling strategies like a cold shower or keeping your room extra cool.

Avoid stimulants like caffeine and energy drinks and experiment with calming protocols like breathwork, non-sleep deep rest, or yoga nidra to down-regulate your nervous system.

The goal is to signal to your body that the work is done, the stress is over, and it’s time to recover. If you transition directly from intense training to bed without any buffer, your body remains in fight-or-flight mode.

Give it time to shift.

Supplementation: Evidence-based Options

Most sleep supplements are overhyped, but a few compounds have legitimate evidence behind them. That said, these should be considered only after addressing the fundamentals of light, temperature, consistency, and caffeine timing.

Magnesium threonate, at doses of two hundred to four hundred milligrams, crosses the blood-brain barrier and increases GABA, a calming neurotransmitter. It may improve sleep latency and quality, particularly if you’re deficient in magnesium, which most people are.

L-theanine, found in tea, promotes relaxation without sedation at doses of one hundred to two hundred milligrams taken before bed.

Glycine, an amino acid found in bone broth, improves overall sleep quality and reduces nighttime waking, though it requires a relatively high dose of two to three grams.

Creatine, typically considered a performance supplement, is also an energy source replenished during sleep. It facilitates slow-wave deep sleep and provides neuroprotection at the standard dose of five grams daily.

Phosphatidylserine, a lipid that lowers cortisol, can be useful if you experience exercise-induced cortisol spikes from late-night training. Four hundred milligrams taken before bed may help, but it only works if cortisol is actually elevated.

What doesn’t work, or is actively harmful:

• melatonin pills don’t replicate the natural release pattern of endogenous melatonin.
• Sleeping pills and benzodiazepines cause sedation, not sleep.
• Antihistamines develop tolerance in ten to fifteen days.
• THC blocks REM sleep and leads to cannabis withdrawal syndrome and dependency.

Supplements are a last resort, so address the fundamentals first, most people never need supplementation if they correct light exposure, temperature, consistency, and caffeine timing.

Napping: The Twenty-Minute Rule

Naps can be restorative if executed correctly, but ensure they are kept to twenty to thirty minutes maximum; anything longer disrupts nighttime sleep by shifting your circadian rhythm and reducing sleep pressure. Nap earlier in the day, ideally before three in the afternoon – if you nap too late or too long, you’ll reduce adenosine buildup and delay melatonin release, making it harder to fall asleep at night.

An alternative to napping is non-sleep deep rest protocols like yoga nidra, breathwork, or guided relaxation. These provide mental and physical restoration without disrupting nighttime sleep. They allow your nervous system to downregulate without entering actual sleep, which maintains your adenosine levels and keeps your circadian rhythm on track.

Sleep Extension Before Competition

Studies on elite athletes show that extending sleep before high-demand periods improves performance. Shooting accuracy, reaction time, and decision-making all improve with additional sleep in the days leading up to competition.

If you have a competition, seminar, or intense training block approaching, extend sleep by thirty to sixty minutes per night for three to seven days beforehand. Focus on consistency and quality, not just duration. You cannot fully “bank” sleep, but you can buffer against upcoming deficits.

Tracking Sleep: Use with Caution

Devices like WHOOP, Oura, and Apple Watch can track sleep metrics, but they’re not perfect.

Even medical-grade polysomnography uses subjective scoring, no consumer device is one hundred percent accurate. The bigger potential problem is orthosomia – the phenomenon where people become anxious about their sleep scores, which then worsens their sleep. If your tracker indicates “poor sleep,” you’ll feel worse, even if you actually slept adequately.

Use trackers for trends, not individual nights. Focus on heart rate variability and subjective feel, not just “sleep score”, the best tracker is the one you wear consistently – the data is a tool, not a diagnosis.

Authors Note

Sleep has fundamentally altered how I approach training, recovery, and performance on the Jiu Jitsu mats.

It has taken a lot of reading and personal research to fully understand sleep architecture and how things would need implementing specifically for me and my routine – recovery is now at the forefront of everything I do, including how I structure my training week.

Generally, my evening coaching commitments dictate that I am locking the academy at around 21:20, once everything is secure I am in the car and winding down. The temperature is set to low, sometimes with the A/C on, the dashboard is dimmed and any music is either soothing, classical or brown/pink noise.

At this point I have already taken 400mg of Magnesium Glycinate to help with relaxation and cognitive function and 100mg of Apigenin ( a chemical found in chamomile tea to help alleviate anxiety).

Previously I have tried and advocated adding, L-Theanine and Phosphatidylserine before bed, but instead now prefer this in the morning with an espresso. I personally find this stack beneficial for cognitive function and work during early morning work on my computer or 1:1 sessions. In the past, I’ve also used various breathwork protocols once I am home and have an Acupressure Mat and Pillow that I’ll combine with this.

Once I get home, my drink of choice is some Turmeric and Ashwagandha Herbal tea, which relaxes me further and reduces any exercise-induced inflammation but truthfully. and by then; I am well on my way to a very good, restful nights sleep.

My rest days are now no longer perceived as a weakness or time wasted – I recognize them as the foundation that permit subsequent hard training days to produce the results I want. I’ve learned that the work I do on the mats is merely the stimulus and I regularly clock 20-hours of Jiu Jitsu per week, where I will engage in sparring most classes.

The adaptation, the growth, the improvement – all of that happens during sleep.

I’ve become protective of my sleep schedule in the same way I’m protective of training time. I maintain consistent sleep and wake times even on weekends – my wife will often catch me looking at the clock at around 21:30 because I’m itching to get into bed and sleep, and the difference is measurable.

Because of better sleep, my recovery between training sessions has improved tenfold, my ability to learn and retain techniques has accelerated. The adequate rest allows my moods to be stabilized, and I’m less reactive to stress, both on and off the mats.

I’ve also learned to recognize the signs of accumulated sleep debt. If my technique starts deteriorating, if I’m getting injured more frequently, if I’m irritable and unmotivated, the problem is rarely the training itself. It’s almost always inadequate recovery, and inadequate recovery almost always traces back to compromised sleep.

The protocols outlined here aren’t theoretical for me. They’re daily practice. I don’t implement all of them perfectly all the time – life doesn’t always cooperate – but I maintain the fundamentals: consistent timing, morning light, cool dark room, no caffeine after 2pm, and no screens after nine.

Sleep is not cool. It’s not complicated. It doesn’t require expensive equipment or elaborate protocols, but it is the foundation upon which everything else rests. You can optimize your training, dial in your nutrition, and implement every recovery modality available, but if you’re not sleeping well, none of it reaches its full potential.

If high-performance living is your goal, sleep is the lowest hanging fruit. It’s free. It’s accessible. And it’s the single most powerful intervention you can make.

Don’t let perfect become the enemy of good. You won’t implement all of this immediately.

Start with one or two changes: consistent sleep and wake times, morning sunlight exposure, cutting caffeine after noon. Build from there. Sleep is a practice, not a destination. Like Jiu Jitsu, it’s the daily repetition – the quiet accumulation of good nights – that produces transformation.

References

Walker, M. (2017). Why we sleep: Unlocking the power of sleep and dreams. Scribner.

Werner, A., Kater, M.-J., Schlarb, A. A., & Lohaus, A. (2021). Sleep and stress in times of the COVID-19 pandemic: The role of personal resources. Applied Psychology: Health and Well-Being, 13(4), 935–951. https://pubmed.ncbi.nlm.nih.gov/34086415/

Leproult, R., & Van Cauter, E. (2011). Effect of 1 week of sleep restriction on testosterone levels in young healthy men. Journal of the American Medical Association, 305(21), 2173–2174. https://pmc.ncbi.nlm.nih.gov/articles/PMC4445839/

Chennaoui, M., Arnal, P. J., Drogou, C., Sauvet, F., & Gomez-Merino, D. (2016). Sleep extension increases IGF-I concentrations before and during sleep deprivation in healthy young men. Applied Physiology, Nutrition, and Metabolism, 41(9), 963–970. https://pubmed.ncbi.nlm.nih.gov/27560704/

Capodilupo, E. (2021). The impact of sleep consistency on health and performance. WHOOP Data Science Publication.

Mah, C. D., Mah, K. E., Kezirian, E. J., & Dement, W. C. (2011). The effects of sleep extension on the athletic performance of collegiate basketball players. Sleep, 34(7), 943–950. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3119836/

Huberman, A. (2021). Huberman Lab podcast: Master your sleep & be more alert when awake. https://hubermanlab.com/

Dijk, D. J., & Czeisler, C. A. (1995). Contribution of the circadian pacemaker and the sleep homeostat to sleep propensity, sleep structure, electroencephalographic slow waves, and sleep spindle activity in humans. Journal of Neuroscience, 15(5, Pt. 1), 3526–3538. https://www.jneurosci.org/content/15/5/3526

Buxton, O. M., Cain, S. W., O’Connor, S. P., et al. (2012). Adverse metabolic consequences in humans of prolonged sleep restriction combined with circadian disruption. Science Translational Medicine, 4(129), 129ra43. https://www.science.org/doi/10.1126/scitranslmed.3003200

Youngstedt, S. D., & Kline, C. E. (2006). Epidemiology of exercise and sleep. Sleep and Biological Rhythms, 4, 215–221. https://onlinelibrary.wiley.com/doi/abs/10.1111/j.1479-8425.2006.00235.x

Kredlow, M. A., Capozzoli, M. C., Hearon, B. A., Calkins, A. W., & Otto, M. W. (2015). The effects of physical activity on sleep: A meta-analytic review. Journal of Behavioral Medicine, 38(3), 427–449. https://link.springer.com/article/10.1007/s10865-015-9617-6

Leproult, R., & Van Cauter, E. (2011). Effect of 1 week of sleep restriction on testosterone levels in young healthy men. Journal of the American Medical Association, 305(21), 2173–2174. https://jamanetwork.com/journals/jama/fullarticle/1029127

Tags: Fitness, High Performance, Jiu Jitsu, Lifestyle, Longevity, Performance, Recovery, Sleep