Hypnic headache (HH) is a rare primary headache disorder (primary headache disorders are those that cannot be attributed to another condition.) It's most identifying feature is that it only develops during sleep and wakes the sufferer.
The International Headache Society's International Classification of Headache Disorders, 2nd Edition (ICHD-II), is the "gold standard" for diagnosing and classifying headache disorders. Here are the description, diagnostic criteria, and symptoms of HH as...Read more
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