Why do I feel tired after 8 hours of sleep?
Last updated September 3, 2026.
Feeling tired after 8 hours usually means the sleep was poor quality, not short - and sleep apnoea is the first thing to rule out. Snoring, gasping, and morning headaches are its calling cards. If sleep checks out, MedlinePlus points to anaemia, thyroid problems, depression, and other treatable causes. Pymander is a free AI doctor, 24/7 by text, and can help you triage.
What to do
- Ask the snoring question: snoring plus gasping plus daytime exhaustion means book a GP visit.
- Cut evening alcohol for two weeks and see whether mornings change.
- Keep a 2-week fatigue diary: sleep times, naps, mood, and energy dips.
- Tired for weeks without explanation? Get checked - simple blood tests find most causes.
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