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Health & FitnessGenerated accuracy model review: 2026-05-06
Sleep Calculator accuracy and testing
This page documents how Calwarden builds trust for this calculator: source notes, regression-style default tests, limitations, assumptions, unit handling, rounding, and visible change history.
Formula source
- Sleep cycles average 90 minutes. A good night's rest consists of 5-6 cycles. * **Formula:** Wake Time = Bedtime + 15min + (Cycles × 90min).
Test cases
Default input regression check
Generated from the checked-in default inputs and calculate function.
Inputs
- I want to...: Wake up at...
- Time: 07:00
Expected outputs
- Suggested Times: 09:45 PM or 11:15 PM or 12:45 AM
- Cycle Count: For 4, 5, 6 cycles
Known limitations
- Sleep cycle length varies by individual (70-120 mins). This uses the 90-minute average.
Assumptions
- The calculator assumes an average 90-minute sleep cycle plus a short amount of time to fall asleep.
- Real sleep cycles vary in length between people and even between nights for the same person.
- Sleep quality, stress, illness, caffeine, and alcohol can matter as much as total time in bed.
Unit handling
- I want to... accepts one of the configured options.
- Time accepts local time values.
Rounding rules
- Number displays use up to 2 decimal places in the calculator UI.
Version history
1.0.0 - 2026-05-06
Generated accuracy and testing page from the current sleep-calculator calculator definition.
Change log
2026-05-06
Published default regression test documentation and metadata fallbacks for Sleep Calculator.
Calculator transparency
Accuracy pages are generated from checked-in calculator definitions and can be upgraded with curated review metadata over time.