Why do I get tired at the same time every day?
Last updated September 3, 2026.
Your body clock runs a roughly 24-hour loop, so energy dips arrive on schedule, especially the early-afternoon one. Irregular sleep, no morning daylight, and heavy lunches make the dip deeper and earlier. Anchoring the clock fixes most of it: same wake time daily, outdoor light in the first hour, morning-only caffeine, and a walk or short nap as a bridge over the trough. Tiredness that fills the whole day, every day, is not a circadian dip: the NHS counts feeling very tired among common type 2 diabetes symptoms, and iron, thyroid, stress, and mood problems look similar, so that pattern deserves a GP check.
What to do
- Hold the same wake time daily, weekends included.
- Get outdoor light within an hour of waking; it anchors the clock.
- Keep caffeine to mornings so it does not mask the dip and wreck the night.
- Bridge the dip with a 10-minute walk or a 15 to 20 minute nap.
- See a GP if the tiredness is all-day, every day, rather than a predictable dip.
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