We always know that adults need 8 hours of sleep each night to get fresh. Is that really true?
The US National Sleep Foundation recommends that people between the ages of 18 and 65 sleep 7-9 hours per night. Indeed, the arithmetic mean is the classic “8 hours”, but that does not mean it’s nailed.
According to the Center for Applied Cognitive Sciences, the number of sleeping hours is not important, but the number of complete sleep cycles. The phase is that we are going through several stages during sleep: we start with the non-REM (fast-eye-movement) stage, which in turn has three stages of depth. After that, we go to REM sleep, that is, the time we dream. Gradual transition from non-REM 1 to the end of REM sleep represents a sleep cycle and lasts for an average of 90 minutes. After the end of the cycle, we take it from the end with non-REM 1.
Taking it from 90 to 90 minutes to get in the recommended 7-9 hour range, we have two possibilities: either sleeping 7 hours or sleeping 9. That means 5-6 complete cycles. If we wake up after 8 hours, we interrupt a sleep cycle and wake up relatively tired.
Now you can calculate exactly what time you should sleep, depending on when the alarm sounds the next day. If you are lazy to calculate, this site does it for you. Sleep Calculator also takes into account the fact that a man takes (on average) a quarter of an hour to fall asleep, so he takes this margin of error.
I told him I wanna wake up at 7:30, so he recommends me to bed in one of the 6 hours listed above. Do you notice that the first two boxes are darker? Those are the recommended sleeping times, those that allow for 6 or 5 complete sleep cycles.
Say, what time you should go to bed?
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