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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.

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1. 1Sleep debt per night = Required sleep − Actual sleep
2. 2Cumulative debt = Σ daily deficits
3. 3Full recovery requires extra sleep (beyond normal hours) on multiple nights
4. 4Cognitive impairment from 6 vs 8 hours is similar to 24-hour total sleep deprivation after 10 days

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