Find Your Optimal Sleep Times
Wake up feeling refreshed by timing your sleep with natural sleep cycles. Our free sleep calculator helps you find the best times to fall asleep or wake up based on 90-minute sleep cycles. Waking between cycles can leave you groggy, while waking at the end of a cycle helps you feel alert.
How to Use This Calculator
- Enter when you need to wake up
- Or enter when you want to go to sleep
- See optimal times based on sleep cycles
- Account for 15 minutes to fall asleep
Features
- 90-minute sleep cycle calculation
- Multiple bedtime/wake time options
- Fall-asleep time accounted for
- Recommended 5-6 cycles (7.5-9 hours)
Frequently Asked Questions
Is this Sleep Calculator free to use?
Yes, our Sleep Calculator is completely free to use with no registration or signup required. Use it as many times as you need.
How accurate is the Sleep Calculator?
Our calculator uses standard mathematical formulas and provides accurate results. For critical financial or health decisions, always consult with a qualified professional.
Does this tool work on mobile devices?
Yes, this tool is fully responsive and works on all devices including smartphones, tablets, and desktop computers.