About This Site
Free sleep cycle planner for bedtime and wake-up times Sleep Calculator is a free online sleep cycle planner that helps you find practical bedtimes and wake-up times based on 90-minute sleep cycles. It can work backward from a target wake-up time or forward from the current time, and it includes an estimated 15 minutes to fall asleep.
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Key Features AI
Core Features
Calculates bedtime from a target wake-up time
Calculates wake-up time starting from the current time
Shows six practical options based on complete sleep cycles
Includes an estimated 15 minutes to fall asleep
Works online with no signup required
Advantages
Free and fast to use
No signup required
Provides multiple bedtime or wake-up options
Includes a realistic sleep-onset buffer
Helpful for planning around fixed morning schedules
缺点:Uses 90-minute cycles as an estimate, not an exact measure
缺点:Sleep timing can vary by person and night
缺点:Cannot guarantee a specific sleep stage
缺点:Not a substitute for medical sleep advice
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