About Sleepy Platypus
A few calm, honest tools for planning sleep, made for the minutes before bed.
What it is
Sleepy Platypus has five free tools: a sleep cycle calculator for bedtimes and wake-up times, a nap calculator with a nap timer, sleep needs by age, a weekly sleep debt calculator and a printable sleep diary that you can also keep on screen.
Where the numbers come from
Recommended hours come from the American Academy of Sleep Medicine consensus statements and the National Sleep Foundation. Cycle lengths, nap lengths and the notes on sleep debt cite the published studies they come from. Each tool page lists its sources with links, so you can read them yourself.
How it works
Every calculation runs in your browser. Nothing you type is sent to a server, and the pages keep working offline once loaded. Your settings and any diary entries are kept in your browser's local storage on this device only.
What it is not
This is not medical advice and not a treatment. The calculators make simple estimates for healthy people, and real sleep varies from night to night. If you have trouble sleeping for weeks, snore loudly, or feel very sleepy during the day, please talk to a doctor.