cluster headaches
"I suffer from migraines and also have difficulty falling and staying asleep.  Following. A sleep study my doctor put me on Zanaflex to help me fall asleep faster and reduced random leg movements during the night.  I took for it about a month and it really helped me sleep although I did have a groggy feeling in the morning that was hard to shake off.   However, it aggravated my migraines so that instead of getting them 2 or 3 times a year, I got a migraine every week during the month I was taking Zanaflex, so unfortunately I had to stop taking it."