I was given a 12 day sample of rozerem about 3 weeks ago because it takes me about 2 1/2 hours to fall asleep, and has been going on for about 2 1/2 years. Rozerem is complete shit! 3 hours later I wasn't the slightest bit more tired than normal. After about 3 nights I gave it up and got ambien instead. It takes about 30 - 45 minutes (usually 30) to fall asleep with it, and if you force yoursself to stay up you kinda walk as if you're drunk, and are in a slightly different state of mind. Bottom line: Rozerem = shit and isn't addictive cuz there's no effect! Ambien = good, and although you can only get about a 2 week prescription at a time (with breaks between) I don't find it addictive (I've gone days between uses). The good thing about rozerem, though, is that the sample pack comes with a free sleep mask and earplugs. yay....

P.S. I get headaches many times/week and neither has seemed to cause more of them or make them worse. No other noticeable side effects, except I'm not sure if the ambien makes me a little more tired than usual in the morning (and I usually wake up around 1p.m.-2:30p.m.