I have a lot of bother trying to get to sleep, which is mainly due to noise. I use those crushable ear plugs you can get, and that helps a lot, and read a novel to "tire" the brain. (A novel with short chapters is best). My sleeping problem is mainly due to noise, and the slightest sound can wake me. I don't know if this will be any good if your brain is just to active to settle down.
Danny