Some of the popular over the counter sleeping pills UK include Diphenhydramine (popular brands include Nytol, Sominex, Compoz and Sleepinal) and Doxylamine (sold under the brand names Sleep aid, Nightime and Unisom) which promotes drowsiness and induce slumber. Other OTC sleeping tablets combine antihistamines with the pain reliever Acetaminophen (available under the brand names Aspirin, Anacin PM and Tylenol PM); whereas Nyquil combines antihistamines with alcohol.