In a typical night, a person goes through four to six sleep cycles1. Not all sleep cycles are the same length, but on average they last about 90 minutes each.
How many sleep cycles is enough?
An average sleep cycle lasts about 90 minutes. Ideally, you want to get five or six of those cycles each night to feel fresh and rested.
Is 3 sleep cycles enough?
While you're asleep, your body cycles through four stages of sleep roughly every 90 minutes, and on a normal night, you get 4 to 6 of these cycles. Sleeping for a couple of hours or fewer isn't ideal, but it can still provide your body with one sleep cycle.
