BedtimePilotSleep duration · Free web tool
To plan 9 hours of sleep, work backward 540 minutes from your wake-up goal, then allow separate time to settle and wind down. The calculator below uses the duration directly, without rounding it to a sleep-cycle boundary. Planned time is not proof of actual sleep, and individual sleep needs vary.
Clock-time example. Dates and daylight-saving changes can affect the actual schedule.
Nine planned hours before a 7 AM alarm mean aiming to be asleep at 10 PM. That requires a 9:50 PM get-into-bed target with the default settling allowance, and wind-down begins at 9:05 PM. Compare those evening constraints with dinner, work and family commitments. If persistent sleepiness continues despite ample opportunity, this scheduling tool cannot explain the cause; that is a reason to seek individual professional advice.
Results are planning estimates based on your times and adjustable settings. They do not detect sleep stages and are not medical advice. Do not reduce your sleep opportunity just to match a cycle count. Seek professional care for persistent sleepiness or sleep-health concerns.
Reviewed for calculation logic, source links, and non-medical product claims.
Use it in context
Nine planned hours before a 7 AM alarm mean aiming to be asleep at 10 PM. That requires a 9:50 PM get-into-bed target with the default settling allowance, and wind-down begins at 9:05 PM. Compare those evening constraints with dinner, work and family commitments. If persistent sleepiness continues despite ample opportunity, this scheduling tool cannot explain the cause; that is a reason to seek individual professional advice.
Move the wake-up input one hour later and every evening checkpoint moves one hour later, while the 540-minute sleep opportunity remains unchanged. Keep the wake-up goal realistic for your obligations.
Questions
No. There are no sleep-stage measurements in this calculator.
Yes. Set the fixed wake-up goal first, then review the planning duration and buffers.
The source links below explain sleep stages and adult duration guidance. They do not prescribe an exact alarm minute.
Learn about reusable plans and reminders in BedtimePilot. Exact duration transfer is not available yet.
BedtimePilot for iPhone