Discover the optimal times to wake up feeling refreshed
A complete sleep cycle lasts about 90 minutes and consists of four stages: three stages of non-REM (NREM) sleep and one stage of REM (rapid eye movement) sleep.
Waking up at the end of a sleep cycle (after 90 minutes) helps you feel more refreshed because you're not interrupting deep sleep. This calculator shows you wake-up times that align with the end of sleep cycles.
Most adults need 7-9 hours of sleep per night, which typically means 5-6 complete sleep cycles. The calculator provides options for different numbers of cycles to suit your needs.