Relapsing remitting hypnic headache responsive to indomethacin in an adolescent: a case report

Hypnic headache (HH) is a rare sleep-associated primary headache disorder that usually begins after the age of 60 years. Here we report a 19-year-old male with 4-year history of predominantly left sided HH. He is the youngest person reported who fulfills the IHS diagnostic criteria for HH. The patient had history of relapsing-remitting course. The headache occurred every night at a constant time in each relapse. It was non-throbbing, moderate to severe, for 30 min to 5 h, and usually after 3 h of sleep. The patient showed complete response to indomethacin (75 mg at bedtime). Frequent tapering of indomethacin was required to look for the remission phase.