They use melatonin too, in combination with other ingredients, I think that makes the trick. You can check their site for the full list as I don't remember them all.

Might be placebo for some, but I really liked Beam Dream. It really helps me to fall asleep quickly and keeps me sleeping until morning without the groggyness of just melatonin. It is pretty pricey though so I only buy it when the site offers me discounts.