If you experience headaches that worsen when you lie down, learn about why this might be happening as well as what you can do to improve your headache symptoms.
Neck and Head Pain When Lying Down: Causes and Remedies
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Head hurts when lying down? Here, a doctor explains why
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Why Is My Period Blood Black, Podcast
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Hypnic Headaches: Symptoms, Causes, and Relief
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ELI5: Why do you get a headache from sleeping for too long? : r/explainlikeimfive