Wake-Up Time Calculator
Find the best wake-up times based on your bedtime and complete sleep cycles.
Updated July 16, 2026·Formula v1.0.0·Editorially reviewed
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What this calculator does
A wake-up time calculator adds your time to fall asleep plus a number of 90-minute sleep cycles to your bedtime, showing several suggested wake-up times so you are less likely to wake mid-cycle.
Formula
Wake time = Bedtime + Sleep latency + (Cycles × 90 min)
Worked example
Bed at 10:45 PM, latency 15 min, 5 cycles → wake at 6:30 AM.
Assumptions
- 90-minute average cycle.
- Consistent cycle length.
Limitations
- Real cycles vary between people and nights.
Frequently asked questions
Can I wake up earlier without feeling groggy?▾
Waking near the end of a cycle tends to feel easier than waking during deep sleep.
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Learn more
Wellness information, not medical advice. This calculator is for general education and planning. It is not a diagnosis and does not replace advice from a qualified health professional.