Sleep: Awareness
Understand what sleep does, what's possible, and where you stand. About 15 minutes.
Sleep occupies roughly a third of your life, and what happens during those hours shapes nearly everything about the other two-thirds. The evidence for its importance is broad and consistent across decades of research.
Adults who regularly sleep fewer than seven hours have a 13% higher risk of dying from any cause. Short sleep is independently linked to heart disease, type 2 diabetes, obesity, and depression. The relationship between sleep and health runs in both directions: poor sleep worsens chronic conditions, and chronic conditions worsen sleep.
The effects on daily performance are equally striking. After 17 – 19 hours without sleep, reaction time and decision-making deteriorate to levels comparable to a blood alcohol concentration of 0.05%. Cumulative sleep restriction over two weeks – sleeping six hours a night instead of eight – produces cognitive impairment equivalent to two nights of total sleep deprivation, and people consistently underestimate how impaired they are.
Sleep also consolidates memory, regulates appetite hormones, supports immune function, and affects emotional resilience. Few other behaviours touch as many systems simultaneously, and unlike many health interventions, improving sleep often produces noticeable benefits within days.
People improve their sleep for different reasons. This site scores every sleep intervention across three core values. Later, you'll set your own weighting across these three values, and the site will rank interventions by how well they deliver on the things you actually care about.
Daily Functioning
Mental alertness, energy levels, focus, mood stability, and physical recovery. People who lean towards this value want sleep that makes them feel sharp and capable the next day. They tend to care most about waking refreshed, sustaining concentration through the afternoon, and having steady energy without relying on caffeine.
Long-term Health
Disease prevention, longevity, and brain health over years and decades. People who lean towards this value treat sleep as a long-term investment. They focus on consistent duration, sleep architecture (the balance of deep and REM sleep), and reducing the cumulative health risks that come from chronic sleep debt.
Comfort & Experience
The subjective quality of sleep itself – how easily you fall asleep, whether you stay asleep through the night, and how pleasant the experience feels. People who lean towards this value care about the sleep environment, bedtime routines, and waking without an alarm. They want sleep to feel good, not just be adequate.
The Top 0.1% band represents roughly 1 in 1,000 people. To give you a sense of what that looks like for each sleep value:
LeBron James averages around 10 – 12 hours of sleep per day, split between 8 – 9 hours at night and a 2 – 3 hour afternoon nap. He keeps his bedroom at 20 – 21°C, completely dark, and avoids screens for 45 minutes before bed. He has called sleep "the best way for your body to physically and emotionally recover and get back to 100 percent." He seems to have maintained this routine throughout a 21-season NBA career, playing at a high level into his early 40s.
Tom Brady went to bed at 8:30 pm and slept at least 9 hours a night for most of his professional career, treating sleep as a central pillar of his TB12 Method alongside nutrition and training. He played in the NFL until age 45, winning his seventh Super Bowl at 43 – an age at which most players have been retired for over a decade. By all accounts, his sleep discipline was non-negotiable rather than aspirational.
Arianna Huffington treats her transition to sleep as what she calls a "sacrosanct ritual." She takes a hot bath with epsom salts and a candle, changes into dedicated sleepwear, bans all electronic devices from her bedroom, and reads only physical books in bed. She reportedly gets eight hours of sleep 95% of nights. After collapsing from exhaustion in 2007, she redesigned her entire relationship with sleep around comfort and enjoyment rather than treating it as a necessary inconvenience.
Awareness means knowing your starting point. Answer each question below – some you might know off the top of your head, others might take a few days to observe or look up.
Daily Functioning
Long-term Health
Comfort & Experience
Your estimated position
Percentiles are estimates based on published population data for adults. Snoring awareness is recorded for your information but not scored, as the available data does not support reliable percentile estimates.
You now understand why sleep matters, what different people get out of it, what's achievable, and where you currently stand. The final step is to set your personal value weightings and see which interventions are the best fit for you.
On the interventions page, adjust the sliders to reflect how much you care about daily functioning, long-term health, and comfort and experience. The table will re-rank interventions to match your priorities.
Awareness assessment complete
You've built your foundation in Sleep. Your self-assessment and value weightings are saved.
View Your Interventions