Ihave Insomnia for years and Melatonin works for me, but you will have to see the dosage and get the right amount. I've tried two type of melatonin and the winner would be GNC Melatonin 3mg (not selling in Malaysia, got it from singapore GNC). Universal Nutrition melatonin 5mg doesn't help at all. Instead it makes me dizzy unlike GNC melatonin, it helps me relax.

Your friend is right. That's why, try something with low dosage like GNC Melatonin which is 1mg only. I don't take it every night before bed, take it only when you feel really cannot sleep. I take it when I'm stress, think too much (on work esp) or when I know that I don't have enough sleep and I need to get to bed early. Cos its pretty hard for you to get your biological clock to shut down at 7 or 8pm right