A retrospective study suggests that chronic insomnia behaves as a neurodegenerative disorder

© 2020 Neutel D, et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.Insomnia is a prevalent sleep disorder. We examined chronic insomnia in terms of subjective and objective measures, according to self-reported duration of disorder. 443 patients were included from a sleep clinic diagnosed with chronic insomnia (ICSD3 criteria). Patients were retrospectively evaluated in terms of medical interview, sleep questionnaires, a standard polysomnography study, and subdivided in subgroups according to disorder duration. We compared patient’s results to a control group. Insomnia and control groups were significantly different in terms of TST, SE, SOL, N1 sleep, REM sleep, REM latency and number of REM episodes (p