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Sleep is central to maintaining your physical and mental health, but many people don't sleep enough. We all do it, but what happens to us when we sleep? 00:22 - Circadian rhythm 00:43 - The four stages of sleep 00:56 - Light sleep 01:11 - Delta sleep and growth hormones 01:32 - Dreams and REM sleep 01:59 - Lifetime average 02:15 - Effects of ...
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