What Is Melatonin?

Melatonin is synthesized from serotonin. The amount of serotonin that you get from sunlight exposure correlates to how much melatonin you will make for that night's sleep cycle. Animals sleep mostly, not all of them, obviously, but animals sleep at night. Octopamine or yeah, closely related to no repinephrine, which is adrenaline for those who don't know.