An overview of the literature is followed by a presentation of the author's view on relations between suicidal behaviors in adolescents and sleep. No specific sleep patterns have been found so far in patients with specific mental disorders and in those after attempted suicide. The only exception are patients suffering from affective disorder s, since changes reported in their case affect almost all parameters of sleep pattern, differing significantly from that in healthy subjects. In children with depression no changes typical of this disorder were found in polysomnography. The changed sleep pattern in schizophrenic patients after attempted suicide should be regarded as related, above all, to changes in the serotoninergic system.