Night eating may occur in two syndromes, which partly overlap but are distinct from one another. In the night eating syndrome, the patient gets up to eat and does it unconsciously, with confusional components, having no recollection of the episode. In the nocturnal eating disorder, the patient gets up to eat, but he/she does so awake and remembers having done so. In both there is a tendency to the intake of high calorie foods, morning anorexia and tendency to gain weight. The possible association with other sleep disorders that require laboratory confirmation, such as sleep apnea, recommends performing lab polysomnography.