There are two stages of sleep:
MORE IDEAS FROM THEBOOK
Each cycle lasts around 90 minutes with different NREM / REM ratios:
There are two main reasons we go to sleep:
"The best bridge between despair and hope is a good night’s sleep."
Sigmund Freud and Carl Jung put forth some of the most well-known theories of dreaming.
....sleep next to their smartphones.
It makes it much harder to go back to sleep, since the blue light emitted acts as a stimulant.
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