Not for colds. Not for pain. Just for sleep. For the relief of occasional sleeplessness, reduces time to fall asleep if you have difficulty falling asleep. Sleep soundly so you can wake refreshed. Non-Habit Forming. ZzzQuil - A non-habit forming nighttime sleep aid for when you just need a good night's sleep. From the makers of Vicks NyQuil. Suggested Use:. Take only one dose per day (24 hours) - see Overdose warning;Use dose cup or tablespoon (TBSP);. Adults & Children 12 years & over - One Dose = 30 mL (2 tablespoons) at bedtime if needed or as directed by a doctor.