[Effect of melatonin on the thrombocyte hemostasis and its circadian organization].

Melatonin produced by pineal gland and some peripheral cells effect both spontaneous and induced aggregation of platelets. As a natural inhibitor of aggregation, melatonin limits hemostasis in night hours. A decrease in the plasma level of melatonin in early morning hours is probably responsible for cardiovascular disorders and may be recommended for use in pharmacotherapy.