melatonin Share definition Flag A natural pill that not only helps you sleep but also gives you more intense vivid dreams. It also increases the chance of having a lucid dream. That 6 mg of melatonin I took before I went to bed gave me a great nights sleep. melatonin by TM January 8, 2005 0 0 Get merch Get the melatonin mug. Buy Now — $32.95 See more merch