BestTimeToSleep is a free set of sleep calculators that help you choose when to go to bed, when to wake up, when to nap and when to have your last coffee.
What we do
Our main sleep calculator works out bedtimes and wake-up times that line up with your natural sleep cycles. You can set your age, how long you take to fall asleep and your cycle length, so the times fit you rather than an average person. We also have tools for naps, caffeine, sleep debt, baby schedules, shift work and jet lag.
How we make our content
Every calculator and article is based on published research and guidance from organisations such as the American Academy of Sleep Medicine, the CDC and the National Sleep Foundation, and we link to our sources on each page. You can read the formulas and assumptions behind each tool on How it works. We review pages when guidance changes.
Not medical advice
Our tools give general information to help you plan your sleep. They are not a diagnosis or a substitute for advice from a doctor. If you often feel tired despite enough sleep, snore loudly, stop breathing during sleep, or have trouble sleeping most nights, please talk to a healthcare professional.
Who we are
BestTimeToSleep is run by a small independent team, the same team behind ClockNow, a world clock that shows the exact time in any city. The site is free to use and supported by advertising.
Contact
Questions, corrections or ideas? Use our contact form or email hello@besttimetosleep.com.