Sleep - GP Hell

Not had good time a my GP. Been told by I dont have Autism. Then showed copy of my NHS diagnosis letter. I thought that was sorted that out.

Then tried to explane that I can not get to sleep and keep awaking up at night. The GP wouldn't have any off it. The GP told me it "Life Choices" that sleepy. By that point I just was not getting anywhere with the GP. 

So do you know where I can get information on sleep problems with Autism.