Gentle targets from 90-minute cycles—not a medical device
Default 90 min cycles + optional minutes to fall asleep
90 is the common rule-of-thumb; you can adjust 60–120.
Sleep “cycles” here mean repeating blocks of the length you set (often ~90 minutes). Real sleep architecture varies by person, age, and health.
This page is not medical advice and does not diagnose sleep disorders.
No. Sleep pressure, caffeine, noise, and disorders change how restorative a window feels. This is a rule-of-thumb grid, not medical advice.
No. Sleep pressure, caffeine, noise, and disorders change how restorative a window feels. This is a rule-of-thumb grid, not medical advice.