I was on 40mg for several months, but it stopped working and I fell into a nasty depression in January this year. Then when my pdoc upped my dose to 60mg, it made me feel really sleepy. So I'm actually going to wean off it once I get to a therapeutic dose of Lamictal.

It was nice while it worked, but it was short lived. Maybe it'll work out for you better than it worked out for me.