What happens when we sleep?
2:45
YouTubeThe Economist
What happens when we sleep?
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 ...
10.8M viewsJan 30, 2019
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