How to use the sleep calculator
- Desired wake time: Choose the time you want to wake up.
- Time to fall asleep (minutes): Estimated time between going to bed and sleep.
- Select the button and review the result.
Worked example
For a 7:00 wake time, options are shown for 4-6 estimated cycles.
Method and limitations
Wake time - whole 90-minute cycles - sleep-onset time.
Sleep cycles vary and timing alone cannot diagnose or treat sleep problems.
Common questions
Why might another result be different?
Inputs, rounding, policies, rates, and assumptions can differ. Compare like-for-like values and use current official information when a rate or rule can change.
Does NidXee save my entries?
No. The calculation runs in your browser. Reloading or closing the page may clear it.