How to use Sleep Time Planner

1. Prepare the required inputs

Explore approximate bedtime or wake times using a 90-minute cycle assumption and time to fall asleep. Use the units and options beside each field. Results update as inputs change; reset returns to example inputs.

I know my: Bedtime — find wake times / Wake time — find bedtimes
Time (24-hour): 24-hour time
Minutes to fall asleep: minimum 0, maximum 120

2. Try a worked example

Bed at 23:00 with 15 minutes to fall asleep gives 06:45 next day for 7.5 hours asleep.

3. Understand the calculation

Wake time = bedtime + time to fall asleep + cycles × 90 minutes. Bedtime reverses this calculation.

4. Read the assumptions

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.

5. Check and compare results

Match entered values to their labels and units. Review output labels alongside the assumptions, then change one input at a time. A currency selector changes display labels without converting amounts. Use the available save or copy actions and retain the input values so the estimate can be reproduced.

6. Fix an invalid input

Complete required fields and respect the listed bounds. Check date order, age relationships and mode-specific requirements where relevant; the error message identifies invalid combinations. Reset to example inputs to recover. A valid calculation applies to its stated model and does not verify a real-world outcome.