GoodSleep is a collection of free sleep calculators and plain-English guides for common sleep questions: how long you will sleep, when to wake from a nap, how many 90-minute cycles you can fit, and how to think about sleep debt.
The site is built to be simple: no accounts, no app install, and no personal sleep data stored on our servers. Calculators run in your browser.
Our articles are educational, not medical advice. If you have chronic insomnia, suspected sleep apnea, severe daytime sleepiness, or any sleep issue affecting your health, talk with a qualified clinician.