I was taking Effexor, which is an SNRI. In the past I've taken cytalopram as well. It seems odd to me that that would help me sleep, but maybe it caused me to have a bit more regular energy during the day and this enabled me to relax at night. Or possibly, it treated my anxiety and depressive mood irregularities, which could be the main reason I don't sleep.

The book I'm reading right now, "Say Goodnight to Insomnia" seems pretty good, though it was written in the late 90s. It talks about anxiety relating to sleep, and actually cites a number of statistics that sort of put my mind at ease about what happens when I don't feel like I get enough sleep. Conquering anxiety about not sleeping is a good portion of the battle.