TempoLife › Nutrition & fitness glossary › Sleep debt
Sleep debt
The running shortfall between the sleep you need and the sleep you get.
Sleep debt is the accumulated gap between the sleep your body needs and the sleep it actually gets. Most adults need roughly 7–9 hours; consistently sleeping six against an eight-hour need builds a two-hour deficit each night that adds up across the week.
It compounds quietly. Six hours a night from Monday to Friday leaves you around ten hours short by the weekend — close to a whole night of missing sleep. The effects show up as worse focus, mood, appetite control and reaction time, and — the unsettling part — people under chronic restriction often rate themselves as "fine" while their measured performance keeps dropping.
You can repay some of it, but not perfectly in one weekend lie-in. The durable fix is adding 30–60 minutes a night at a fixed wake time until the debt clears, protecting the last hour before bed, and keeping caffeine out of the evening. The sleep-debt calculator turns your week into a concrete number and a recovery plan.
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Frequently asked questions
Sleep debt?
The running shortfall between the sleep you need and the sleep you get. Sleep debt is the accumulated gap between the sleep your body needs and the sleep it actually gets. Most adults need roughly 7–9 hours; consistently sleeping six against an eight-hour need builds a two-hour deficit each night that adds up across the week.
