Sleep Cycle Calculator

About Sleep Cycles

A good night's sleep consists of 5-6 complete sleep cycles. Each cycle lasts about 90 minutes. Waking up in the middle of a cycle can leave you feeling groggy, while waking up between cycles helps you feel refreshed.

• 90-Minute Cycles: The brain goes through stages of sleep every 90 minutes.
• Timing is Key: Waking up at the end of a cycle is optimal.
• Ideal Duration: Most adults need 7.5 to 9 hours (5-6 cycles).
• Falling Asleep: The average person takes 15 minutes to fall asleep.
• Recommended: Aim for 5 or 6 cycles for best rest.

Sleep Stages