A sleep inducer is a substance, activity, or condition that promotes sleep and relaxation. Some commonly known sleep inducers include chamomile tea, lavender oil, warm milk, and soothing music. Other synonyms for sleep inducer may include sedative, tranquillizer, relaxant, calmative, anodyne, somniferous, soporific, and hypnotic. Sedatives and tranquilizers are commonly prescribed by doctors to help people with insomnia or other sleep disorders. Relaxants and calmatives refer to anything that can help reduce stress and anxiety, which can promote relaxation and make it easier to fall asleep. Anodynes are pain relievers, which can help alleviate any discomfort that may be keeping you awake.