cluster headaches
"This has been great so far, been on it for 7 months and has helped reduce the amount of migraines and constant neck and shoulder tightness/pain. I can only take it at night as I still will become sleepy even after this long but way better just at night then not at all. The dry mouth hasn't lessened either, but only lasts about 4 hours, so if you don't fall asleep right away it can be annoying."