SLEEPCOACHGAME · answers

What is deep sleep?

Deep sleep is Stage 3 NREM sleep, also called slow-wave sleep — the deepest, most restorative stage, when brain and body activity fall to their lowest. In it, your body repairs, your immune system strengthens, your memory settles in, and your brain is washed clean of the waste that builds up during the day. It mostly happens in the first half of the night.

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Four restorative processes that happen during deep sleep, Stage 3 NREM slow-wave sleep: body and muscle repair, immune system strengthening, memory consolidation, and the brain being washed clean of waste.
Deep sleep is Stage 3 NREM: the stage where the body repairs and the brain clears itself.

The restorative stage

What your body is doing while you are under.

It repairs the body. Heart rate, blood pressure and breathing drop to their lowest, growth hormone is released, and muscles and tissues rebuild.
It strengthens immunity. Deep sleep is when the immune system does much of its maintenance work.
It settles memory. The day's learning is consolidated into longer-term storage.
It clears the brain. The brain flushes metabolic waste that builds up during waking hours (Xie et al., Science, 2013).

Deep sleep concentrates in the first half of the night and is the hardest stage to be woken from — which is exactly why a full, uninterrupted early night matters so much.

Getting more of it

It is earned by the habits around it.

You do not will deep sleep into happening — it arrives when the habits around the night are right: caffeine kept to the morning, screens set aside, a cool dark room, daytime movement, morning light, a steady schedule. 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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