Sleep

The stages of sleep, how many hours you need and simple habits to sleep better.

5 articles

The stages of sleep and what each one does for you

While you sleep, your body moves through different stages — light sleep, deep sleep and REM sleep — and each one takes care of a part of you. Deep sleep repairs the body, REM organizes memories and emotions, and light sleep ties it all together. What matters most isn't any single stage, but cycling through all of them, several times a night.

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How many hours of sleep you really need

There's a general range that works as a reference for most adults, but your right number is individual and shifts with age and life phase. More important than hitting an exact target is waking up rested, with regularity and good sleep quality. The best way to find your measure is to notice how you feel across your days.

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Sleep hygiene: habits that improve your nights

Sleep hygiene is the set of daytime and bedtime habits that help you sleep better — light, timing, screens, caffeine and environment. None of it is magic: they're simple adjustments that, added up and kept, make a difference. And small consistent changes tend to work better than drastic overhauls.

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How sleep connects to your recovery and energy

Sleep is the foundation of your recovery: a bad night usually shows up the next day in your energy, mood, training and even appetite. So looking at sleep alongside other signals — like heart rate variability and energy — tells a fuller story than any data point alone. Seeing it all in one place helps you understand what your body is asking for.

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How to read your sleep report

Your sleep report shows numbers like duration, regularity and stages — but they're estimates that point to trends, not a diagnosis. What's most valuable is following the direction over weeks, rather than reacting to a single bad night. Use the report to spot patterns and talk about them better, never to diagnose yourself.

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From reading to your routine

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These guides explain health in general. Nuya explains your health — from your exams, your routine and your history. Already on the App Store.

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