😴 Sleep Cycle Calculator
Calculate the best wake-up or bedtime based on 90-minute sleep cycles for refreshed mornings.
When should I wake up?
When should I go to bed?
📖 About Sleep Cycles
A complete sleep cycle is approximately 90 minutes (1.5 hours), including light sleep, deep sleep, and REM. Waking naturally at the end of a cycle leaves you refreshed; waking during deep sleep causes grogginess. Aim for 5-6 cycles per night (7.5-9 hours).