😴Sleep Debt Calculator
Adults: 7-9 hrs
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.
- 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
Need 8hr · Get 6hr for 5 nights=10 hours sleep debt · ~5 nights of +2hr extra sleep to recoverFull cognitive recovery takes several days
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Fun Fact
Matthew Walker's research shows that sleeping 6 hours per night for two weeks produces the same cognitive impairment as 24 hours of total sleep deprivation — yet most people feel "fine" after a week of 6-hour nights.
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