Like most of the posters here, I too find my anxiety is worse at night. I think that it is worse for several reasons. I think at night we are lying there in bed, quiet with nothing on but our "busy brains". This causes us to think more and you know what happens when you start thinking too much, well, panick attacks, worrying and stuff. I also think that we might make it worse for ourself because we might, on some level, expect to be more anxious at night, thus, we are waiting for it. Just a thought I had on it.
Last year, when I was having an extremely difficult time, I literaly refused to sleep at night because I was afraid that I would die. It was the worse feeling I have ever had. So, I was a night owl. I slept during the day. When I began therpay, my T, PDoc and I worked very, very hard to get me back on track. It took several months and even still sometimes I find that I am up until 2 or 3 am. I try to limit my naps, which can be very hard because sometimes that is all I want to do. Sleeping makes it all go away, at least for a little while.

Anyway, I use Ambien for the really difficult nights and Ativan helps also when I am panicky. Helps me relax enough to drift off to sleep.

Your not alone.