How much sleep debt do I have?
Add up the last week against the hours you usually need. A steady shortfall is a different problem from one rough night.
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How this works
Sleep debt is a simple sum: the hours you slept over about a week, compared with the hours you think you need. It is not a medical score, and it does not say why a night ran short.
A useful starting point for most adults is about 7 hours or more. Some people sit a little higher. The number you pick here is an experiment, not a prescription.
The pattern of the week matters more than any one night. A steady shortfall often responds to a slightly earlier bedtime with a fixed wake time. A pair of long nights after five short ones is closer to weekend drift. A single very short night in an otherwise ordinary week is usually something to get through, not something to "pay back" by sleeping in for hours.
None of this replaces a conversation with a professional if you are dangerously sleepy in the day, especially around driving.
Questions people ask
- Can I pay sleep debt back at the weekend?
- A little extra can take the edge off, but a long lie-in often shifts your clock. A steadier week usually does more than one long night.
- Is 7.5 hours the right target?
- It is a common starting point, not a rule. Most adults need about 7 hours or more. Adjust the slider and notice how you feel, rather than chasing a perfect number.
- What if I sleep enough hours and still feel exhausted?
- Hours in bed do not guarantee restorative sleep. That pattern is worth a medical conversation rather than another bedtime habit.
This tool is educational, not medical advice, diagnosis or treatment. Persistent or severe sleep problems deserve a qualified medical assessment.