Lack of sleep and stress for me. Never during a stressfull episode but always on the back side of an event. I'm probably due for one now infact. It will hit out of the blue and I'll be in total darkness for 8-12 hours with an ice mask on my face. It hurts like hell to close my eyes, the effort is just too much. If I move I'll barf. If a light goes on I'll barf,. Imitrex does nothing at all, Duraden(sp), does almost as much. I just have to wait it out, hopefully I'll fall asleep but that rarely happens.

Good luck

Don