I'm nearly two years post concussion syndrome and sleep is still an issue. I wake two or three times a night and have trouble getting to sleep again, I was fine before my injury. Like you I've tried a variety of things but nothing seems to work. Some nights are better than others but I can't find any pattern as to why some nights are better than others. Insomnia is probably one of the most persistent PCS symptoms as sleep is so complex. I've reached the stage now where I try to forget about it and remain optimistic it will sort itself out in time and I'll be able to enjoy what was one of my favourite pastimes again!