Ambien did not help me sleep at all.

just as a suggestion I have been listening to audio books.

If you lay down to sleep turn on a relaxing......no horror....book and just listen. Even if I do not fall asleep I am still and totally relaxed in bed.

Some nights I do sleep some and do not realize it until I figure out I missed something important in the book. Or it could be soft music, but I found the books to keep my interest more thus occupying my mind from thinking too much.

I also take Melatonin 5mg. as prescribed by my physical med/rehab doc.
A warm cup of Camille tea never hurts.
Good luck!