What is a sleep cycle?

A sleep cycle lasts about 90 minutes and includes light sleep, deep sleep, and REM stages.

How many cycles do I need?

Most adults need 5–6 cycles (7.5–9 hours). Waking between cycles helps you feel refreshed.

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What is a sleep cycle?: A sleep cycle lasts about 90 minutes and includes light sleep, deep sleep, and REM stages.
How many cycles do I need?: Most adults need 5–6 cycles (7.5–9 hours). Waking between cycles helps you feel refreshed.