The term 'Sleep Aid Brand' refers to three different brands of sleep aids: Unisom (6 letters), Ambien (6 letters), and Sominex (7 letters). Unisom is a brand of sleep aid that contains the active ingredient doxylamine succinate, which is an antihistamine that helps reduce difficulty in falling asleep. Ambien is a brand of sleep aid that contains the active ingredient zolpidem, which is a sedative-hypnotic drug that helps people fall asleep faster. Sominex is a brand of sleep aid that contains the active ingredients diphenhydramine hydrochloride and acetaminophen, which are both antihistamines that help reduce difficulty in falling asleep.