Sleep Time Planner
Explore approximate bedtime or wake times using a 90-minute cycle assumption and time to fall asleep.
Your results
- 7.5 hours asleep
- 06:45 (next day)
- 9 hours asleep
- 08:15 (next day)
Calculations run in your browser. Results are estimates where described below.
How the calculation works
Wake time = bedtime + time to fall asleep + cycles × 90 minutes. Bedtime reverses this calculation.
Worked example
Bed at 23:00 with 15 minutes to fall asleep gives 06:45 next day for 7.5 hours asleep.
Assumptions and limits
Sleep cycles vary and are not reliably fixed at 90 minutes. These are planning options, not guaranteed optimal wake times. The options allow 7.5 or 9 hours of sleep.