There are at least two problems, that involved disordered eating at night. Night Eating Syndrome (NES) and Nocturnal sleep - related eating disorder (NSRED). Night eating syndrome is considered as a dissomnia. It is really an eating disorder; people eat when they are conscious. NES is characterized by the clinical features of morning anorexia, evening hyperphagia, awaking followed by nocturnal food ingestions. NSRED is classified in the International Classification of sleep Disorders as a parasomnia. It is thought to be a sleep disorder, not an eating disorder. During episodes of NSRED people are not conscious. They háve no memories to having doně when they wake or they háve only fragmentary memories. In some cases, háve histories of alcoholism, drug abuse and other sleep disturbances. Nearly all sleep eaters show a preference for food high in carbohydrates and fat. One to two percent of the generál populations are affected with these. NES and NSRED are more common than this generally recognize. Increase stress and fluctuations in hormone levels may be ethiological factor. Changes in the circadian rhythm by an attenuation in the nocturnal decrease of the plasma concentration of melatonin and leptin and an increase of cortisol háve been described. Treatment of nocturnal eating behavior begins with a clinical interview and a night or two at a sleep disorders centre where brain activity is monitored. NSRED does tend do respond well to treatment with medications. Sleeping pills should be avoided. Exercise and relaxation training help NES sufferers overcome insomnia and restore natural sleep cycle.

        Key words: Night Eating Syndrome, Night Sleep Related Eating Disorder, neurotransmitters, hormone