Hypnic Headache, the One Nicknamed for the Alarm Clock

Hypnic headache wakes people at close to the same hour, night after night. In a 1998 case series of 19 new patients (Dodick, Mosek and Campbell, Cephalalgia), whose title uses the nickname, the patients woke at a consistent time, usually between 1 and 3 a.m. (63%), and 68% had an attack more than four nights a week.

They were not young. Average age at onset was 60.5, and 84% were women. Three of the 19 had the same headache during daytime naps, which suggests sleep itself rather than the clock is the cue. In 68% of patients the attacks cleared within two hours.

Examination, tests and brain imaging showed nothing at diagnosis, so other causes have to be ruled out first, and anyone waking this way should see a doctor before settling on the label. For ordinary night waking, the 3 a.m. piece and steps for falling back asleep are the better starting points.

Three short answers

Does caffeine help hypnic headache?

In the 19-patient series it helped four people, as a tablet or a drink. Lithium was also tried, but its side effects made four patients stop it. Treatment belongs with a physician.

Is it dangerous?

The authors call it benign. Severity mostly stayed the same or eased over time, and only one patient got spontaneous relief. A new headache that wakes you from sleep still deserves a medical check.

How common is it?

The paper calls the syndrome rare and gives no prevalence figure. The 19 patients were new cases added to those already in the literature, which makes the series a description of who gets it rather than an estimate of how many do.