If you don't have a reason to sleep in or stay on this sleep pattern, like for a job, maybe you could start to change your sleep cycle. It sounds like you've changed your cicadian rhythm and how you're sleeping. If you've slept like this for a long time it will take awhile to change.

But it might be something you wanto look at. It doesn't involve drugs & might help to be up during the day, ware yourself out & hopefully you'll be tired at the end of the day & less anxious.
Just a thought tho.