Find the perfect sleep or wake time based on 90-minute sleep cycles. Waking between cycles means you feel refreshed instead of groggy.
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Sleep Cycle Table
4 cycles
6 hours
5 cycles ✅
7.5 hours
6 cycles ✅
9 hours
Frequently Asked Questions
You likely woke up mid-cycle. Waking between cycles — even with less total sleep — feels more refreshing. Our calculator shows exact times aligned with cycle ends.