Sleep issues are a thing. I had a really hard time sleeping for quite awhile when I got sober. Eventually my body decided it was going to get into a good cycle.
That being said, some individuals really do struggle and it just doesnt seem to matter what they do. I like Biminis thoughts on sleeping in two phases/ cycles.
Perhaps seeing a doctor again is a good idea especially if your family also struggles. It could be hereditary. I dont know.
I wish for you loads of sleep. You will find a way to get there. Keep on walking forward.