How to Calculate Sleep Debt
What is Sleep Debt?
Sleep debt is the cumulative effect of insufficient sleep. Each hour of sleep deficit impairs cognitive performance, mood, and physical health. The brain does not fully "forget" sleep debt — it accumulates across weeks.
Step-by-Step Guide
- 1Sleep debt per night = Required sleep − Actual sleep
- 2Cumulative debt = Σ daily deficits
- 3Full recovery requires extra sleep (beyond normal hours) on multiple nights
- 4Cognitive impairment from 6 vs 8 hours is similar to 24-hour total sleep deprivation after 10 days
Worked Examples
Input
Need 8hr · Get 6hr for 5 nights
Result
10 hours sleep debt · ~5 nights of +2hr extra sleep to recover
Full cognitive recovery takes several days
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