NiceSleep
Using this website
Planning and education
The free tools provide arithmetic estimates from your entries. Guides are general information for adults, not individual medical advice. Tools do not measure sleep, set a device alarm, or guarantee a result.
Health concerns
If you regularly have trouble sleeping, unexplained daytime sleepiness, or concerning breathing symptoms, speak with a qualified healthcare professional. Do not use a calculator or app score to make medical decisions.
Product information
Features, availability, pricing, and compatibility may change by version and region. App-store listings and in-app purchase information are the source for current commercial terms.
Sources and corrections
We aim to keep information clear and current. Report an error to [email protected]. Linked websites have their own terms.
Updated October 11, 2026