SLEEPCOACHGAME · answers

How much deep sleep do I need?

Most adults need about 1.5 to 2 hours of deep sleep per night — roughly 15–25% of a full 7–8 hour night — and it mostly arrives in the first half of the night. You don't schedule deep sleep directly: it arrives on its own when your total night gets its full hours and the habits around it are right.

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Diagram of a typical 8-hour adult night: deep sleep makes up about 1.5 to 2 hours, which is 15 to 25 percent of the total night, mostly arriving in the first half of the night.
A typical adult night: deep sleep is about a quarter of it, front-loaded into the first half.

The numbers

What a healthy amount looks like.

Adults: about 1.5–2 hours a night. That's 15–25% of the recommended 7–8 hours of total sleep, which itself supports long-term health across decades of follow-up (Cappuccio et al., Sleep, 2010).
It arrives early. Deep sleep concentrates in the first half of the night — one more reason a steady bedtime matters more than a long lie-in.
It changes with age. Deep sleep naturally declines across adulthood (Ohayon et al., Sleep, 2004); children and teenagers get more, in service of growth.
Night-to-night variation is normal. One short night says little; the trend across a week, and how you feel in the morning, says more.

In those 1.5–2 hours: your body repairs, your muscles recover, your memory settles in, your heart rests, and your brain is washed clean (Xie et al., Science, 2013). That's what the number is buying you.

Getting yours

You earn the hours through habits.

Deep sleep responds to the habits around it: caffeine kept to the morning, screens set aside before bed, a cool dark room, daytime movement, morning light, and a steady schedule — weekends included. Each habit has a thief version that steals deep sleep and a trained version that gives it. SLEEPCOACHGAME shows you 12 real-life scenes in 58 seconds, you answer Green Light or Red Light, and your AI Coach names the thief your round caught and the swap that gives your deep sleep.

Deep sleep turns waking up into something you look forward to.

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