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.
Entered the hotel room, looked around and noticed that the door to the bathroom was roting and the shower had mold.
Decided to stay cause it was in a tourist town during busy season (no rooms anywhere else) and we were only staying for a night.
Husband woke up at 3am cause he felt something crawling up his arm. The bed was full of bedbugs.
Put all the lugagge in the moldy bathtub and slept (tried to) with the light on cause again, no choice.
It's been more than 3 years and we have not recovered from the trauma.