Wherefore Art Thou, Sleep?

Aren't depressed people supposed to be able to sleep? What's this crap about? Actually, to clarify - once I fall asleep, I'm down for the count. In fact, I can sleep an inordinate amount of time without feeling any guilt at all (we're talking near coma-like conditions). The problem is, I can't fall asleep to save my life. I thought the problem was the loss of my beloved pillow, as the replacement just hasn't been cutting it. Yesterday I bought another new pillow (a Joe Boxer pillow that I already love with all my heart), which I can tell is going to be awesome. Still, sleep eludes me forever and ever. Last night I think I finally fell asleep around 4 a.m. Ugh! What's wrong with me? Why can't I sleep? While I'm no stranger to insomnia, I kinda thought my neverending, all-encompassing, life-crippling depression would trump stupid insomnia. Apparently I thought wrong. :(