Sleep Cycle Calculator

Sleep Cycle Calculator helps you wake up refreshed by timing your sleep around 90-minute sleep cycles. Pick a wake-up time to see the best bedtimes, or tap "sleep now" to see the best times to wake up — each suggestion shows the cycle count and hours of sleep.

FEATURES
• Wake-up planner: choose a wake time, get 4 suggested bedtimes (6, 5, 4 and 3 cycles)
• Sleep-now planner: get 4 suggested wake-up times if you fall asleep now
• Every card shows the number of sleep cycles and total hours of sleep
• Adjustable fall-asleep buffer (default 15 minutes)
• Clean, simple card layout with a 12/24-hour time picker
• No accounts, no tracking, no permissions

Works offline — nothing is recorded or sent anywhere.

This is a simple calculator based on the common 90-minute sleep-cycle estimate. It is not medical advice.

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