Taking melatonin every night can be habit forming. But if it works, then who cares, just be aware that missing a dose of the melatonin can cause "wide awake" nights. As for Risperdal I've never taken it. Remember everyone responds a little different from each drug. Will never know if you don't try it. Make sure you have a "back up plan" for your anger or rage. Sometimes finding a safe outlet for that can be just as effective as taking a medication to control it, with no "side effects". Good luck, keep us informed of how this works out for you.