R U able to describe your insomnia in more detail?
Many years ago I was in a very busy responbile job which would keep me awake, then I would worry that I would be useless the next day. One night I thought 'well this hasn't killed me yet and I've not knowingly made any mistakes' and went to sleep. Crass but I didn't have problems after.
I have used anti-histamines or anti-travel sickness [Kwells ]. medication briefly when going through a traumatic family issue. It enabled me. My GP gave me 5 tablets, 1 at night - I managed with 3 to get me back into a pattern: I found the 2 remaining last week in the cabinet: prescribed in 1989.

It can be a mind set. It may be due to hormones rising/falling which causes disturbance, or even needing to pee often. Do make sure that u remain hydrated, don't stop drinking at night because the kidneys will work harder.
I often fall asleep in my bubble bath
