Sleep Cycle Calculator

TipTinker

Contains adsIn-app purchases

About this app

Sleep Cycle Calculator works out the best times to fall asleep or wake up so your alarm does not interrupt deep sleep. Choose a wake-up time and the app lists several bedtimes spaced by full ninety-minute sleep cycles, or choose a bedtime and see the wake times that complete four, five, or six cycles.

Key features
• Bidirectional planner: find bedtime from wake time, or wake time from bedtime
• Adjustable fall-asleep buffer for the minutes it takes you to drift off
• Tunable cycle length when yours runs shorter or longer than average
• Age-group highlights for adults, teens, and children
• Quick-start presets for common alarms, bedtimes, and power naps
• Saved plans with notes and a shareable summary
• Modern edge-to-edge design optimized for all devices

Each suggestion shows how many cycles and total hours of sleep it delivers, with the recommended window highlighted for the age group you pick.

What’s new

UI improvements and bug fixes