Health & Fitness Tools / Sleep Cycle Calculator
Sleep Cycle Calculator
Find the best times to wake up or fall asleep based on 90-minute sleep cycles.
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Sleep Cycle Calculator
Find the best times to wake up (or fall asleep) based on 90-minute sleep cycles.
Features
- Two modes: wake-up time or bedtime
- Based on 90-minute sleep cycles
- Shows multiple options at once
- 100% free, no signup
How to Use
Step 1
Choose whether you want to set a wake-up time or bedtime.
Step 2
Enter that time.
Step 3
Click Calculate Sleep Times to see your options.
About This Tool
Sleep Cycle Calculator works backward or forward from a wake-up time or bedtime using 90-minute sleep cycles, helping you time your sleep to wake up feeling less groggy.
Frequently Asked Questions
Why 90-minute cycles?
Sleep naturally moves through cycles of roughly 90 minutes, and waking up between cycles rather than in the middle of one tends to feel less groggy.
Does everyone have exactly 90-minute cycles?
It varies slightly by person, so treat these times as a helpful guide rather than an exact science.