I too cannot sleep d/t trigeminal neuropathic pain - after 3 years I found that I need to "layer" my medicine. Some MDs will call it dual therapy. I know this sounds like a very high dose but I understand about the need to sleep:
I take 1) Ambien 5 mg 2) Amitry 100 mg 3) Ativan 1 mg.
I worked for a doc for 35 years and he always said "You need something BIGGER than the pain". Hope this helps.