Sleep
I can sleep about 18 hours a day. I have a history of depression but my medication is theoretically working. Lately, i fall asleep at about three in the morning and get out of bed at three in the afternoon, then i nap from five to seven, then i watch tv and fuck around on the computer until three in the morning again.
My situation improved when I looked at it as a sleeping disorder both separate and a part of my depression.
Don't eat food before you go to bed and give yourself something meaningful to do when you wake up. You'll find that in time you'll be more motivated to be awake.
Also, don't rely completely on any depression pills to fill that void you feel in your life. Do your best to make friends and to build a life that you can be happy with. There is no magic pill.