People can go several days without sleep, but eventually you will sleep! Keep that in mind that it won't last forever. It's important, especially for people who are depressed, to get a regular sleep schedule going; go to bed at the same time and wake up at the same time every day. You might try a mild over-the-counter sleep aid (Benadryl works well) at first to get yourself on track. If it lasts for a while (a couple weeks or more), though, you should see a doc.