How Many Sleep Cycles Do You Actually Need?
Most adults need 5 to 6 cycles a night — here's why the number matters more than the hours.
Read →Writing on sleep
Short, practical pieces on how sleep actually works.
The Best Time to Wake Up, According to Sleep Science
Why timing your wake-up to the end of a cycle beats setting an alarm for a round number.
Read →Is 6 Hours of Sleep Enough? What the Research Says
The honest answer for most adults — plus who can actually function on less and why.
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