Average adult takes 10 to 20 minutes to transition into sleep.
Recommended Bedtimes
09:45 PM
6 sleep cycles (9.0 hours)
11:15 PMOptimal
5 sleep cycles (7.5 hours)
12:45 AM
4 sleep cycles (6.0 hours)
02:15 AM
3 sleep cycles (4.5 hours)
Waking up in the middle of a 90-minute sleep cycle causes sleep inertia and morning fatigue. Waking at the end of a cycle leaves you feeling alert and refreshed.