Definitions and epidemiology of insomnia

Definitions and epidemiology of insomnia Complaints of poor sleep are numerous and frequent in the general population. One of the most important is insomnia. As it is a subjective complaint, it can be difficult to define and diagnose. Various nosologies propose a common definition even if no consensus has yet been reached. Insomnia may be associated to or be the consequence of various psychiatric and somatic comorbidities. The purpose of this article is to present various definitions used to diagnose insomnia and provide updated knowledge about its prevalence, incidence, determinants and consequences.