StarvardI have to wake up at
Sleep runs in cycles of about 90 minutes. Waking at the end of a cycle feels far better than waking in the middle of one. Add about 15 minutes to fall asleep.
I am going to bed at
Same math, other direction: here are the wake times that land at the end of a cycle.
Six full cycles is the classic full night. For the science of why this works, see the Sleep course.
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