Restoril (temazepam), more commonly referred to by its brand name Restoril, is an innovative medication developed for treating insomnia and related sleep disorders. Restoril's effectiveness lies in helping those experiencing trouble sleeping fall asleep faster while experiencing deeper, uninterrupted slumber. Restoril's active ingredient, temazepam, belongs to the group of medications known as benzodiazepines and works by increasing GABA activity in the brain - leading to reduced brain activity, relaxation and sedation and an aiding sleep.