I am not currently on any anti-depressants. I've been doing well off of them for about ten years, and two months or so ago my depression symptoms suddenly came back (including the insomnia). I take prescriptions for other ailments but I don't think any of them effect my sleep.

HOWEVER after posting this I finally got a few hours of rest but when I woke up I had a hacking cough. After a few hours I got concerned and went to the doctor, turns out I have pneumonia. I'm on an antibiotic now and feeling pretty miserable.

So maybe that was percolating last night and causing the strange night.