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How many hours of sleep do I actually need?
Most adults need 7–9 hours a night. Consistently getting less builds a sleep debt that measurably affects focus, mood and appetite.
For healthy adults the well-established range is 7 to 9 hours a night. A minority genuinely function on a little less, but far more people who claim to are simply used to being under-slept — the research is clear that self-rated "I'm fine" drifts upward even as measured performance keeps falling under chronic restriction.
The shortfall compounds quietly. Sleeping six hours against an eight-hour need is a two-hour deficit every night, which is roughly a full night's sleep missing by the end of the working week. That debt shows up as worse concentration and reaction time, lower mood, and — relevant to weight — appetite hormones that push you toward eating more.
You can repay some of it, but not perfectly in one weekend lie-in. The durable fix is a slightly earlier, consistent bedtime with a fixed wake time, rather than swinging between deprivation and catch-up.
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General information, not medical advice. Figures are mainstream reference values; individual needs vary.
