I like Benedryl
Makes me fall asleep hard and fast. The only thing with Benedryl is that you need to take it a long time before you need to wake up. 8+ hours. You need to take it 45 to 1 hour prior to sleep and you can only do it if you have a full 7 or 8 hours to sleep. Otherwise you'll wake up and it'll still make you feel groggy. But, assuming you take it early enough, it's fantastic