Sleep inducers are substances or activities that aid in the onset of slumber. There are several synonyms that can be used to refer to sleep inducers. They include sedatives, hypnotics, somnifacients, soporifics, sleep aids, and tranquilizers. Sedatives and hypnotics are drugs that slow down brain activity, leading to drowsiness and sleep. Somnifacients and soporifics refer to substances that induce somnolence, causing one to feel sleepy and lethargic. Sleep aids are non-prescription remedies used to promote sleep. Tranquilizers are drugs that calm the body and mind, reducing anxiety and aiding in sleep onset. No matter the label, sleep inducers play an essential role in promoting healthy rest and rejuvenation.