Fall Asleep Fast When you're having trouble getting that sound sleep your body craves, add some Zzzs to your night with ZzzQuil. ZzzQuil works to help you fall asleep fast - in as little as 20 minutes - so you can get sleep when you need it and wake refreshed. Non-Habit Forming All ZzzQuil products are non-habit forming and specifically formulated with clinically proven ingredients by our team of dedicated scientists. It contains a non-habit-forming ingredient, Diphenhydramine HCI, which causes drowsiness by blocking the action of histamine, a chemical that sends waking signals to the brain. Each dose (one 30 mL dose cup) contains 50 mg...