A familiar situation
Planen Sie eine Schlafenszeit rückwärts von der gewünschten Aufstehzeit oder umgekehrt.
How to use this calculator
- Enter wake-up or bedtime, i want to, time to fall asleep and the remaining inputs.
- Select Calculate to see the answer and its breakdown.
- Keep a scenario, change an input and compare the results.
Use consistent units and check the assumptions below before applying the result.
How sleep is calculated
Plan wake-up or bedtime windows around approximate 90-minute sleep cycles and a configurable time to fall asleep. Sleep cycles vary between people and across the night; the suggestions are planning estimates, not a diagnosis or a promise to wake refreshed. If you need to wake at 07:00 and take 15 minutes to fall asleep, six cycles suggest bedtime near 21:45. The calculation validates each input and keeps its stated units explicit. No. Cycle duration varies, so treat the times as rough planning anchors. This is an estimate for the stated assumptions; confirm measurements and any applicable professional or local standards before relying on it.
Sleep Calculator is calculated from the supplied measurement fields using the units shown.If you need to wake at 07:00 and take 15 minutes to fall asleep, six cycles suggest bedtime near 21:45.
Assumptions & useful context
Approximate cycle planning; individual sleep needs vary.
Frequently asked questions
Are sleep cycles exactly 90 minutes?
No. Cycle duration varies, so treat the times as rough planning anchors.
How much sleep should I target?
Needs vary by age and health; follow reputable clinical guidance rather than optimizing only for cycle count.