Sleep Time Calculator
Calculate your ideal bedtime or wake-up time based on natural sleep cycles for better rest and energy
Calculate Your Sleep
Recommended Sleep Times
Extended Sleep
Optimal Sleep
Minimum Sleep
Very Minimum Sleep
Understanding Sleep Cycles
Sleep Cycles
A full sleep cycle lasts about 90 minutes and includes both REM and non-REM sleep. Waking between cycles helps you feel more refreshed.
Optimal Sleep
Most adults need 5-6 complete sleep cycles per night (7.5-9 hours). The recommended 7-9 hours accounts for time to fall asleep.
Sleep Quality
Waking during light sleep (end of a cycle) makes you feel more alert. Interrupted deep sleep can cause grogginess.
Sleep Health Blog
The Science of Sleep Cycles
Discover how your body moves through different sleep stages and why completing full cycles is essential for restful sleep.
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Learn practical strategies to improve your sleep environment and habits for more restorative rest.
Read MoreUnderstanding Sleep Disorders
Explore common sleep disorders, their symptoms, and when to seek professional help for sleep issues.
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