Bedtime Calculators
Pick your bedtime to see the optimal wake-up times for a full night's sleep. Our calculations are based on 90-minute sleep cycles, so you wake up between cycles instead of during deep sleep — meaning no grogginess and no sleep inertia.
Medical Disclaimer
The information provided by Sleep Stack is for educational and informational purposes only and is not intended as medical advice. It is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the advice of your physician or other qualified health provider with any questions you may have regarding a medical condition or sleep disorder. Never disregard professional medical advice or delay in seeking it because of something you have read on this website.
Reviewed by Dr. Sarah Mitchell, PhD — Board-Certified Sleep Medicine · Last reviewed · Full disclaimer