Those who experience insomnia or shift workers who want to change their internal clock may want to consult a doctor about a prescription to purchase Rozerem. Ramelteon, the active ingredient in Rozerem, works differently than most Rx sleep aids. It is not classified as a controlled substance so you have little worry about in regards to addiction or dependency and your doctor can prescribe it as a longer term sleep medication. Rozerem is best suited for those with sleep onset insomnia, difficulty falling asleep, because it is metabolized quickly in your body.