Don't forget that whatever method you adopt repetition and time are the most help. Like exercise or quitting smoking, eventually your body will get the message that now it's time to go to sleep, and now it's time to wake up. But it takes practice to make a habit. I heard once a habit takes on average 36 consecutive attempts, so expect at least a month or more before you don't feel like you're trying anymore and it just happens on it's own.