Unisom is a trusted over-the-counter sleep aid containing doxylamine succinate, an antihistamine known for its effectiveness in alleviating temporary insomnia. It is specifically formulated to help those who struggle with falling asleep or maintaining restful sleep throughout the night. With its proven efficacy, Unisom is a popular choice for those seeking relief from occasional sleeplessness, and it is produced by reputable manufacturers under this and other brand names.