Bellyknots,It did give me some insomnia, but my doctor advised taking it in the morning, and I noticed it didn't bother me as much when I did that. If it does give you sleep problems, your doctor might be able to give you a little something to help counteract that side effect. My doctor advised me to take half a Xanax if I was having trouble getting to sleep. Thankfully that side effect seems to have passed for now. I do get a bit of twitching in my legs when I'm about to fall asleep, but it's very mild.The only other 2 side effects I had were some initial sleepiness when I began taking it, which wore off after a couple weeks, and elevated blood pressure. The blood pressure could be the result of the drug, or my family history of it, or the fact that I'm a type A person, so I'm not the best person to go by when it comes to that side effect. I may not be able to stay on Effexor for long because the blood pressure tends to stabilize and then get high again, but I fight tooth and nail to try and keep at it, because of how much better I am in terms of anxiety.I'm on 75 mg, by the way. The starting dose is 37.5, so that may be all you need.Hope that helped you some and feel better soon!