Hi
I went though this back in 2006 when I first got my Anx. I tried everything. Drugs worked but I would wake early. How I conquered it was:-
I changed the time of going to sleep dramatically everyday. Never the same time each day. This I found broke the cycle of thought patterns that build up with routine.
I forced myself to get up and read if I was not asleep after 10 Mins. Sometimes I stayed up all night and felt terrible all day, good job I could come and go at work.
After 2 Weeks of this I found my body reacted by forcing me to go to sleep at any time of the day. I used to fight it and only go to sleep after 10pm.
I started walking everyday 4 miles 2 miles in a morning 2 miles at tea time.
It felt I was trying to trick my mind in to sleeping.
I read some great books. I now fall asleep very easy and mostly in front of the TV. I wake at 5am ish and go upstairs to differing success of getting back off to sleep. Same rules apply at 5am get up after 10 Mins and read a book, make a cup of hot milk. Light the open fire and fall asleep when I cant keep my eyes open anymore.
Hope this helps a little. Do the opposite to what you want.
Mee