Exhausted, but Can't sleep

I am completely exhausted. Spent. On the cusp of depression, I'm so tired. But I just can't sleep. Not only that, I can't seem to get myself to bed. The thought of lying down and sleeping makes me anxious. It's like I don't want to "miss anything". But what could I possibly miss at 12:15 am, Sunday? Good thing it's Sunday. I can sleep in. No church until 1 pm. Ahhhhhhhhhhh!!