Sleep Cycles
Sleep Calculator: Find Your Best Bedtime
Never wake up groggy again by timing your natural 90-minute cycles.
Learn how sleep architecture governs mental sharpness and recovery.
Never wake up groggy again by timing your natural 90-minute cycles.
Learn how sleep architecture governs mental sharpness and recovery.
A complete sleep cycle passes through Light Sleep, Deep Sleep, and REM sleep, lasting ~90 minutes.
Waking at the end of a cycle feels effortless. Waking in the middle of Deep Sleep triggers sleep inertia.
Most healthy adults need 5 full cycles (7.5 hours) or 6 cycles (9.0 hours).
Choose what time you need to wake up or when you want to sleep to get recommended times.
Educational tool only. Does not replace individualized clinical diagnosis.