How we calculate
Six blocks give nine hours at the default reference. An earlier wind-down may be needed to preserve a fixed morning. More time allocated does not prove you slept for all nine hours.
Cycle reference · Free web tool
6 Sleep Cycles: Timing and Duration
6 sleep cycles × 90-minute planning reference ≈ 9h planned sleep. Actual human sleep cycles vary. Settling and wind-down are additional time, not part of that duration. These reference blocks do not measure your actual sleep stages or predict an ideal alarm boundary.
Free planning tool
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Sleep cycles vary from person to person and across the night. We use 90 minutes as a planning reference, not a measurement of your actual sleep stages.
Your selected plan · 6 cycles
- Wind down
- Get into bed
- Aim to be asleep
- Wake-up goal
Important limitations
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.
Scientific references
Last reviewed
Reviewed for calculation logic, source links, and non-medical product claims.
Use it in context
Two ways to apply the plan
Bedtime examples
For a 7:00 AM wake-up goal, start winding down at 9:05 PM, get into bed at 9:50 PM, and target sleep at 10:00 PM. For a 8:00 AM wake-up goal, start winding down at 10:05 PM, get into bed at 10:50 PM, and target sleep at 11:00 PM. Evening times before midnight are on the previous day. These examples allow 10 minutes to settle and 45 minutes to wind down.
Wake-up examples
Getting into bed at 10:00 PM, with 10 minutes to settle, gives a 10:10 PM sleep target and a 7:10 AM wake-up time the next morning. Getting into bed at 11:00 PM, with 10 minutes to settle, gives a 11:10 PM sleep target and a 8:10 AM wake-up time the next morning. These are planning estimates, not predictions of sleep stages or guaranteed alertness.
Questions
What to know before using the result
Does this measure my sleep?
No. There are no sleep-stage measurements in this calculator.
Can I adjust the plan?
Yes. Set the fixed wake-up goal first, then review the planning duration and buffers.
Where can I read the evidence?
The source links below explain sleep stages and adult duration guidance. They do not prescribe an exact alarm minute.
Turn your timing into a nightly routine.
Carry your selected cycle reference and evening buffers into BedtimePilot, with reminders to wind down and get into bed. Your plan stays a schedule, not a measurement of sleep stages.
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