This video features Dr. Cheri Mah, a sleep scientist and professor at the Stanford Sleep Medicine Center, discussing the relationship between sleep and athletic performance in elite athletes, and underscoring how profoundly sleep affects our lives and outcomes. She explains the negative effects of sleep deprivation on cognition, emotional regulation, and injury risk, and offers practical sleep improvement strategies covering sleep environment, diet, napping, and sleep management during travel. Her overarching message is that sleep must be treated as an essential investment in life and actively managed.

1. The Importance of Sleep and Dr. Mah's Role 😴

Dr. Cheri Mah describes herself as both a sleep physician and a sleep scientist, saying she spends a great deal of her time educating people and advocating for sleep as a top priority. She points out that while we spend roughly a third of our lives sleeping, many people fail to manage sleep properly — sacrificing it and overlooking it entirely. Her core philosophy is: "If you're not getting your best sleep, you can't be your best self."

"If you're not getting your best sleep, you can't be your best self. Or to flip it around: if you are getting your best sleep, you will be your best self."

Dr. Mah works closely with elite athletes and highlights that sufficient sleep can dramatically improve performance — citing remarkable results such as a 9% improvement in free-throw percentage and a 12% reduction in reaction time. She describes sleep as a critical foundation of life, one that shapes mood, functioning, and overall performance the following day. She likens sleep to something "free, healthy, and safe" that delivers benefits including clearer thinking, better decision-making, improved mood, and greater productivity — but emphasizes that to gain those benefits, you must invest time and effort in your sleep.

2. Sleep Myths and Truths 💡

Dr. Mah addresses several common misconceptions about sleep. The first is the false belief that you can perform at your best on just four to five hours of sleep. In the past, cutting back on sleep was sometimes worn like a badge of honor, but she notes that this attitude is shifting as prominent athletes like Tom Brady and Simone Biles have publicly championed the importance of eight or more hours. Today, Dr. Mah says, there is growing recognition that getting fewer than eight to ten hours actually puts you at a disadvantage.

The second myth is the idea that everyone needs the same amount of sleep. The American Academy of Sleep Medicine and the Sleep Research Society recommend a minimum of seven hours, but she explains this is a floor, not an ideal — depending on the individual, eight, nine, or even more hours may be necessary. Dr. Mah mentions that she personally feels unwell on seven hours and needs eight to nine, underscoring the importance of discovering your own sufficient sleep duration.

She also emphasizes that small changes create big differences. If you currently sleep six hours, adding just 15 to 30 minutes per night can accumulate to roughly two extra hours over a week and produce noticeable improvements. She cites research on high school students showing that 15 extra minutes of sleep made the difference between an A and a B grade, while 11 extra minutes separated a B from a C — demonstrating that even modest increases in sleep time have meaningful effects on academic performance. 😲

3. Elite Athlete Sleep Research Results 📈

Dr. Mah discusses a study published in 2011 involving male basketball players. The research encouraged players to extend their nightly sleep to nine to ten hours over five to seven weeks, effectively paying down accumulated sleep debt, and then examined the effects on performance. The results were striking:

• Free-throw percentage improved by 9%
• Three-point shooting percentage improved by 9%
• Reaction time reduced by 12%
• Sprint time reduced by 4% (from 16.2 seconds to 15.5 seconds)

Dr. Mah stresses that these were not just one-percent gains — they were nine percent or even double-digit improvements. In elite sports, where a single percentage point can determine a win or a loss, gains of this magnitude mean that sleep can be a genuine competitive advantage.

3.1. NBA Scheduling and Its Relationship to Sleep

Dr. Mah mentions the "NBA Schedule Alert Project" she conducted in collaboration with ESPN. Over three seasons, she was able to predict with 76–86% accuracy when an NBA team was most at risk of losing, based solely on the schedule and opportunities for sleep deprivation — regardless of team strength.

She cites a Monday Night Football study as an example: when a Western Conference team played a night game against an Eastern Conference team, the Western team beat the Las Vegas point spread 68% of the time across 25 seasons. This is because the body clocks of Western Conference players are better aligned for late-night games. Even when traveling east, Western teams are in their biological prime during the 4–8 p.m. window (Pacific time), while Eastern teams competing at late hours (Eastern time) are at a circadian disadvantage.

4. Lives Changed by Sleep: Andre Iguodala and Ryan Jensen 🌟

Dr. Mah shares compelling stories of how sleep transformed — and even saved — the careers of several athletes.

4.1. Andre Iguodala: Elevated Performance and an Extended Career

Andre Iguodala of the Golden State Warriors was someone Dr. Mah worked with closely. At 28, an All-Star player, he wanted to play as long as possible and was trying to anticipate when his career might decline. He honestly admitted he had been sleeping poorly — staying up until the early hours playing video games, sleeping for a few hours before practice, then returning home for a two-to-three-hour nap, a pattern he had maintained for a decade.

Dr. Mah collaborated with Iguodala over several months to improve his sleep habits:

• Pre-sleep preparation routine: Reading a book before bed to relax both mind and body.
• Thought-clearing time: Stretching or meditating before sleep to quiet a racing mind.
• Sleep environment optimization: Keeping the bedroom dark and cool (around 19.4°C), and removing electronics from the room.
• Nap adjustment: Reducing multi-hour naps to 20–30 minutes and timing them relative to game time to maximize alertness and focus before competing.
• Nutritional choices: Making dietary choices that supported sleep.
• Sleep extension: Increasing sleep from under seven hours to 7.5–8+ hours per night to pay back years of accumulated sleep debt.

These changes had an extraordinary impact on his performance:

• The following season, the Warriors won the championship for the first time in years, and Iguodala was named Finals MVP. 🏆
• He went on to win three more championships, earning four rings in total.
• His career extended by a decade.
• As his sleep grew from under seven hours to 7.5–8+ hours, his three-point shooting percentage doubled.
• Free-throw percentage increased by 8.9% — the same figure Dr. Mah found in her basketball research.
• Points per minute increased by 29%.
• Personal fouls decreased by 45%.

Dr. Mah says Iguodala described changing his sleep habits as having "changed everything," and holds him up as an inspiring example of how sleep can unlock new potential even in the finest athletes.

4.2. Ryan Jensen: Career Rescued by Sleep Apnea Treatment

Dr. Mah cites NFL player Ryan Jensen as another case where sleep "saved a career." Cut from the Ravens and demoted to the practice squad, Jensen was in such poor shape that his father told him "you're not yourself — you made your mother cry." He was eventually diagnosed with sleep apnea.

Sleep apnea is an extremely common sleep disorder in which the airway is partially or completely blocked during sleep, severely degrading sleep quality. Jensen began CPAP (Continuous Positive Airway Pressure) therapy, which kept his airway open throughout the night and allowed him to obtain restorative sleep. Four years later, Jensen signed a $42 million contract as one of the highest-paid centers in the NFL, and three years after that, in 2021, he won the Super Bowl alongside Tom Brady with the Tampa Bay Buccaneers. This case is a dramatic illustration of how sleep — or its absence — can nearly end a career and then bring it back to the highest level. 🏈

4.3. The Link Between Sleep and Emotional Regulation

Reflecting on the story of Ryan Jensen making his mother cry, Dr. Mah explains why sleep deprivation makes us more likely to upset the people around us. When we are sleep-deprived, our ability to regulate emotions deteriorates — we become more irritable, more moody, and more prone to reacting emotionally.

"When you're sleep-deprived, you're not regulating your emotions well. We tend to be more irritable, more grumpy, and to react emotionally."

The brain's amygdala — the center of fear and emotion — can become hyperactivated under sleep deprivation. Steven notes that when sleep-deprived he feels as though he is operating purely from the amygdala, and deliberately avoids making important decisions or engaging in difficult conversations. He mentions that Jeff Bezos has said a CEO's most important job is making sound decisions, which requires eight hours of sleep every night — an anecdote that underscores the profound impact sleep has on cognition and decision-making.

5. Practical Strategies for Quality Sleep 🛌

5.1. Sleep Environment: Create a "Cave"

Dr. Mah advises making your bedroom "dark, quiet, cool, and comfortable" — like a cave — to promote quality sleep.

• Dark: She strongly recommends blackout curtains or a sleep mask.
• Quiet: Use earplugs or a white noise machine to block external sounds. White noise machines are particularly effective at masking hard-to-control disturbances like garbage trucks or construction noise. On listening to the radio or a podcast while falling asleep, she says "if it helps you relax, that's fine," but advises against a TV with bright light.
• Cool: 16–20°C (60–67°F) is considered the optimal temperature range for sleep. She suggests lowering the temperature by one or two degrees every few days to find your personal sweet spot, as it may feel too cold at first. A temperature-regulating mattress topper is also a viable option.

5.2. Timing Your Shower or Bath 🚿

Taking a hot shower or bath immediately before bed can actually interfere with sleep. Hot water raises core body temperature just before sleep onset, when the body needs to cool down in order to fall asleep. It is therefore better to finish showering or bathing one and a half to two hours before bed. Doing so allows body temperature to drop naturally, shortening the time it takes to fall asleep and potentially enhancing deep sleep — which is critical for muscle recovery and repair.

5.3. Pre-Sleep Nutrition 🍎

Avoid heavy, greasy meals right before bed, but going to bed too hungry can also disrupt sleep. Dr. Mah recommends a "pre-sleep snack" before turning in:

• An ideal combination is 50% carbohydrates + 50% low-fat protein.
• Examples: Whole-grain cereal with milk (low sugar), cottage cheese with fruit, whole-wheat crackers with peanut butter, nuts with yogurt.
• These snacks digest slowly overnight, maintaining satiety until morning, preventing hunger-related wake-ups, and supporting sound sleep.

The worst food combinations for sleep include alcohol, caffeine, heavy greasy or tomato-based meals (such as fried foods with ketchup), and high-sugar carbohydrates close to bedtime. Tomato-based foods in particular can trigger acid reflux in some people. She warns that sleep deprivation drives the brain to crave more carbohydrates and sugary foods, creating a vicious cycle that can lead to weight gain and other health problems.

5.4. Managing a Racing Mind 🧠

It is common to lie in bed with a busy mind and struggle to fall asleep. Dr. Mah offers strategies to address this:

• "Thought-clearing" time: About 10 minutes under dim lighting before bed to organize your thoughts.
  • Stretching and deep-breathing exercises: These activate the parasympathetic nervous system — the "rest and digest" system — to relax the body and mind. Activating it slows the heart rate, deepens breathing, and produces a state of physiological calm as a counterweight to the sympathetic "fight or flight" response.
  • Journaling: Writing down thoughts or feelings on paper.
  • To-do list: Jotting down tomorrow's tasks in advance to reduce anxiety.
• The bed is only for sleep and sex: Avoiding wakeful activities in bed (watching TV, using a smartphone, working) helps train the brain to associate the bed with falling asleep, not staying awake.

5.5. Strategic Napping (Nappuccino) ☕️

Dr. Mah addresses the misconception that napping doesn't work, and highlights the benefits of short naps:

• 20–30-minute power nap: A short nap that stays in the lighter stages of sleep — without entering deep sleep — sharpens alertness and temporarily improves focus and concentration. Entering deep sleep can actually make you feel groggier and more disoriented upon waking, a phenomenon known as sleep inertia.
• Nappuccino: A unique method to maximize the benefits of napping. Drink a caffeinated beverage (such as espresso), then immediately take a 20–30-minute power nap. Since caffeine begins taking effect roughly 15 minutes later, the caffeine boost and the nap's restorative effect converge right as you wake, producing superior alertness and performance gains.

5.6. Alarm Clocks and the Snooze Button ⏰

Dr. Mah does not recommend hitting the snooze button. Rather than fragmenting sleep by tapping snooze multiple times, she says it is far better to set the alarm a little later and sleep undisturbed until you wake once and get up. The final stages of sleep are rich in REM sleep, which is critical for learning and memory consolidation. Hitting snooze disrupts REM sleep and degrades its quality, so setting one alarm and rising immediately is the best way to maximize REM.

5.7. Chronotype 🦉

Dr. Mah explains that every person has a unique chronotype. There are night owls (like Steven) who go to bed late and wake late, morning larks who go to bed early and rise early, and everything in between. She praises Steven's practice of never scheduling meetings before 11 a.m. as a very smart strategy for honoring and leveraging his chronotype. Aligning your daily schedule with your body clock can optimize both productivity and overall well-being.

5.8. School Start Times and Teen Sleep 🏫

Dr. Mah touches on how school start times affect student sleep, and highlights California's decision to push back start times for high school and middle school students. Adolescence is a period when the body clock naturally shifts later, meaning that early school starts lead to chronic sleep deprivation, which in turn is associated with lower academic performance, mental health struggles, and increased traffic accidents. Delaying school start times has been shown to have positive effects on student attendance, grades, and mental health.

5.9. Sleep Management During Travel ✈️

Dr. Mah offers specific strategies to minimize jet lag and travel fatigue:

• Before travel:
  • Pack early: Prepare your bags well ahead of time so you are not losing sleep the night before a flight.
  • Get sufficient sleep: Securing at least seven hours of sleep before a flight can ease jet lag and travel fatigue.
  • Shift your body clock: For a three-hour time difference, start going to bed and waking up 30 minutes earlier each day for two to three days before the trip, and get morning light exposure. As a general rule, it takes about one day to adjust per hour of time zone change.
• During travel:
  • Stay hydrated: Dehydration worsens jet lag, so drink plenty of water.
  • Sync to the destination: Try to sleep and eat according to the destination's time zone.
  • Sleep kit: Bring an eye mask, earplugs, noise-cancelling headphones, and a travel pillow to facilitate sleep on the plane.
  • Limit caffeine and alcohol: Minimize or avoid caffeine and alcohol during the flight.
• After travel:
  • Get sunlight: Exposure to natural light is the most powerful signal for resetting your body clock.
  • Use sunglasses strategically: There may be certain times of day when you should avoid light exposure; follow app guidance or wear sunglasses accordingly.
  • Minimize demands on arrival: Avoid important meetings or peak-intensity workouts on the first day; give your body time to adapt. Jet lag can also increase injury risk.
  • Strategic naps and caffeine: Use short power naps or caffeine strategically to push through daytime drowsiness.

5.10. Sleep Aids (Melatonin) 💊

Melatonin may help advance the body clock when dealing with jet lag. However, it can have side effects (such as next-day grogginess), and because it is not regulated by the US FDA, the actual content may differ from the label. For athletes, using an NSF Sports-certified product is the safer option. Dr. Mah prioritizes building a natural sleep environment and improving habits over relying on medication.

5.11. Sex and Sleep 💖

Dr. Mah reiterates that the bed should be reserved for sleep and sex only. Keeping other activities out of the bedroom helps the brain associate the bed with sleep. While rigorous research on the specific effects of sex on sleep is limited, she acknowledges that — as Steven mentions — some people feel sex aids sleep consolidation. However, a bed partner's movements or snoring can still affect sleep quality.

6. Sleep Debt and Oversleeping 💰

6.1. Sleep Debt

Dr. Mah believes sleep debt is real and accumulates over time. Each night you fall short of your needed sleep (e.g., eight hours), that deficit adds up. For example, sleeping only six hours a night means accruing two hours of debt per day — ten hours by the end of the week. Sleeping ten hours on the weekend pays back two hours, but leaves eight hours of debt remaining.

"Your body requires a certain amount of sleep every night. If you don't meet that demand, debt accumulates."

Repaying sleep debt requires sleep extension — getting additional sleep over time. Short-term debt (days or weeks) can be recovered, but you cannot "bank" sleep in advance. Recovering sleep debt improves reaction time, reduces fatigue, and enhances performance. When an upcoming project or demanding schedule threatens your sleep, getting extra sleep for a few days beforehand is a viable strategy for minimizing the debt.

6.2. Oversleeping

Dr. Mah generally does not believe in "oversleeping" as such. When people feel groggier or more tired after nine or ten hours, she explains this is likely due to a sudden shift in sleep schedule (e.g., waking three hours later than usual) or a temporary feeling of relaxation as pent-up sleep debt is resolved — not the extra sleep itself. While some research links sleeping more than ten hours with elevated risk of illness and mental health issues, she notes that this is likely because underlying conditions such as depression or chronic illness cause longer sleep, rather than long sleep causing those problems — a case of comorbid conditions, not causation.

6.3. The Importance of REM and Deep Sleep 💤

Sleep cycles through light sleep, deep sleep, and REM sleep approximately every 90–120 minutes.

• Deep Sleep: More abundant in the first half of the night; triggers the greatest release of growth hormone and is critical for muscle recovery and repair.
• REM Sleep: More abundant in the early morning hours; crucial for learning, memory consolidation, and skill reinforcement. Vivid dreams upon waking are a sign you emerged from REM sleep.

After learning new information or skills, sleep acts like pressing the save button. Without sleep, learned content cannot be consolidated into long-term memory and the foundation for new skills remains fragile.

7. Sleep Apnea 😴

Dr. Mah warns that snoring is not merely a habit — it can be a signal of a sleep disorder. She strongly recommends consulting a doctor and undergoing a sleep study if you snore.

• Obstructive Sleep Apnea (OSA): A very common disorder in which the airway is partially or completely blocked during sleep. It is found in roughly 26% of adults between the ages of 30 and 70 — about one in four people.
• Symptoms: Not feeling refreshed in the morning, daytime fatigue, excessive reliance on caffeine or napping, early-morning awakening (3–5 a.m.), loud snoring, pauses in breathing or gasping (which a roommate or partner may notice).
• Risk factors: Being overweight or obese increases risk, but even young, fit athletes can develop it due to anatomical factors.
• Treatment: Approaches like CPAP (Continuous Positive Airway Pressure) are highly effective.

Sleep apnea is extremely common, yet many people delay diagnosis and treatment, allowing it to negatively affect sleep quality and overall health over the long term.

8. Sleep Excuses and Injury Risk 🤕

8.1. The "I Don't Have Time" Excuse

Dr. Mah says one of the biggest excuses people give for not prioritizing sleep is "I don't have time." She pushes back on this, arguing it is not true — strategic time management and small adjustments can carve out the sleep time you need.

• A five-minute investment: Executing a brief relaxation routine or optimizing your sleep environment for just five minutes before bed is entirely achievable.
• Prioritization: Instead of sacrificing sleep, consider what sleep can give you back and restructure your time accordingly.

8.2. Sleep Deprivation and Injury Risk

Several studies suggest that sleep deprivation raises injury risk:

• Fewer than six hours: Young athletes showed higher rates of fatigue-related injuries.
• Fewer than eight hours: Athletes sleeping less than eight hours had roughly 1.7 times (170%) the injury risk of those sleeping eight or more hours.

Dr. Mah studied the effects of sleep deprivation on movement mechanics and found that after several nights of poor sleep, the variability in movement patterns increases. In other words, sleep-deprived athletes move in less efficient, less consistent ways rather than relying on their preferred movement strategies, raising injury risk. For example, a vertical jump becomes less consistent and the coordination between the knees and hips changes, increasing the likelihood of injury.

9. Conclusion: Sleep Is the Start of Tomorrow 🚀

Dr. Cheri Mah emphasizes how important it is to change how we think about sleep — to see it not as "the end of today" but as "the start of tomorrow." How we prepare for sleep and what we do to secure enough of it has an enormous impact on our functioning, our interactions, and our ultimate performance the next day.

"Sleep is not the end of today — it is the start of tomorrow."

She says that to become the best version of yourself, sleep must be the foundation of everything. If you are willing to invest time and effort in sleep, the returns will be immense — and it may completely transform your life. She encourages every listener to try even one small change tonight, noting that such shifts can be game-changers capable of altering the entire trajectory of your life. The remarkable transformation that sleep can bring is a gift earned through patience and consistent effort. 🎁