[Anxiety, insomnia, depression--in conjunction with or opposite to functional disorders].

This review presents the data on the prevalence of anxiety disorders, insomnia and depression. General mechanisms of the pathogenesis for these conditions in respect to organism's stress- reactions to the environmental changes are considered. The specific commonality of neurotransmitter reactions, polysomnographic pictures, genetic predisposition is discussed. Specific characteristics of the sleep structure in anxiety disorders, insomnia and depression are noted. A role of comorbidity of anxiety disorders, depression and insomnia and importance of their differentiation, especially in primary care, is emphasized.