Calculate sleep duration and cycles. 90-minute sleep cycles. Find optimal wake time for refreshed mornings.
Calculate sleep duration and cycles. 90-minute sleep cycles. Find optimal wake time for refreshed mornings.
Category: Rekenmachines • Free online tool • No signup required
This tool provides general estimates and does not constitute medical advice. Always consult a qualified healthcare professional for medical guidance.
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RekenmachinesAverage time to fall asleep (default 14 min)
Sleep debt warning
Some options are below the recommended 7-9h for Adult (18-64). Consider choosing more cycles for better rest.
Based on 90-min cycles • 14 min fall-asleep offset
Light sleep → Deep sleep → REM → Light (each cycle ~90 min)