I've been carefully regulating my caffeine usage and that has helped a lot. Only 1 cup of a coffee a day and it has to be before 3, only lower-caffeine teas after that, and no caffeine after 6. Other than that it's helpful to find something which calms your mind to get some sleep, figure out how long it takes of that to get to to sleep, and schedule all your pre-sleep needs when deciding when to go to bed. also just dont look at a clock after you decide to go to bed, it will only make your more anxious about lost sleep, preventing sleep.