Sleep Cycle Calculator
Calculate your optimal sleep and wake up times.
Sleep Cycle Information
A good night's sleep consists of 5-6 complete sleep cycles. Our calculator helps you align your sleep with these natural rhythms.
Why Sleep Cycles Matter
Sleep isn't just about the number of hours—it's about quality and timing. Your body goes through natural 90-minute sleep cycles, each consisting of light sleep, deep sleep, and REM (dream) sleep. Waking during a light phase leaves you refreshed; waking during deep sleep leaves you groggy.
5-6 Complete Cycles
Adults need 5-6 complete 90-minute cycles for optimal health and cognition.
Science-Backed Timing
Our calculator uses research-proven sleep architecture to find your best bedtimes.
15-Min Fall-Asleep Buffer
We account for average sleep onset latency so you wake at optimal times.
From the Blog
Explore our latest articles on sleep science, tips, and health.
Complete Your Health Picture
Sleep is one pillar of wellness. Explore our other health calculators—BMI, age, water intake, and more—to optimize every aspect of your health.
Explore All Tools→Frequently Asked Questions
This calculator provides general guidance based on sleep science research. Consult a healthcare provider for personalized sleep advice or if you suspect a sleep disorder.