How long is one sleep cycle?

One sleep cycle lasts approximately 90 minutes and includes light sleep, deep sleep, and REM sleep stages.

How many sleep cycles do I need per night?

Most adults need 5 to 6 complete sleep cycles per night, totaling 7.5 to 9 hours of sleep.

Waking up mid-cycle causes sleep inertia — the groggy, disoriented feeling. Waking at the end of a 90-minute cycle feels more natural and refreshed.

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