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💤 Sleep Debt Calculator

Find out how much sleep you've missed — and how to pay it back

Hours slept each night this week

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sleep debt this week
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Avg per night
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Total this week
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Days to recover

What is sleep debt?

Sleep debt is the cumulative difference between the sleep you need and the sleep you actually get. If you need 8 hours and sleep 6, you accumulate 2 hours of sleep debt per night — 10 hours after a 5-day work week.

The bad news: sleep debt is real and it compounds. The good news: it can be recovered, but it takes longer than one weekend.

💡 Can you "catch up" on sleep? Yes — but only partially. Research shows it takes 4 days to fully recover from 1 hour of sleep debt. A full week of sleep deprivation can take 3 weeks to recover. Weekend catch-up sleep helps, but doesn't fully undo the weekday damage.

What sleep debt does to your body

🧠 Brain fog

After 17 hours awake, cognitive performance equals 0.05% blood alcohol — legally drunk.

😤 Mood

Even one bad night doubles emotional reactivity. Chronic debt causes anxiety and depression.

⚖️ Weight gain

Sleep debt increases ghrelin (hunger hormone) and decreases leptin (fullness hormone) — you eat ~300 more calories per day.

🦠 Immunity

Getting 6 hours instead of 8 makes you 4x more likely to catch a cold when exposed to a virus.

❤️ Heart

Sleeping less than 6 hours regularly increases heart disease risk by 48% and stroke risk by 15%.

🩸 Diabetes

One week of poor sleep can induce pre-diabetic blood sugar levels in healthy adults.

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