let’s say you’re going to sleep and you know you have 5h15 of sleep from now, is it better to wait so you have around 4h30, so 3 whole sleep cycle and you don’t wake up in the middle of your 4th, or it doesn’t really matter?
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The length of the cycles isn’t like a stopwatch, the time in Rapid Eye Movement Sleep (REM sleep) can change depending on how tired you are. https://youtu.be/ABKpJ8hQn8o
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