[Sleep disorders in the elderly].

Insomnia dominates the sleep disorders of the elderly. Sleep apnea, the restless legs syndrome and nocturnal agitation represent other facets. After eliminating the possibility of painful or degenerative organic disease, iatrogenic cause and mode of life, other symptoms should be sought, namely mental and personality-related. Investigation requires polysomnogram recording, supported by careful history-taking, including objective and subjective factors. Treatment includes notions of diet, biological rhythm and desynchronisation. It should take into consideration the deleterious effects of prolonged use of certain psychotherapeutic agents.