Circadian Rhythm Sleep Disorders: Nosological classification, definitions, and epidemiology

In part 1 of a 2-part series, we take a look at what the Sleep Medicine Textbook, 2nd Edition presents on circadian rhythm sleep disorders, specifically the nosological classification, definitions, and epidemiology.

Nosological classification, definitions, and epidemiology

Circadian rhythm sleep-wake disorders are common. In such disorders, there is a persistent or recurrent pattern of sleep disturbance that is due to alterations of the circadian timing system or a misalignment between the individual endogenous circadian rhythm and exogenous factors influencing the timing, duration, and quality of sleep.

The disorders include delayed sleep-wake phase disorder, advanced sleep-wake phase disorder, irregular sleep-wake rhythm disorder, and non-24-hr sleep-wake rhythm disorder, in which there are internal clock alterations, and jet lag disorder and shift work disorder, in which external factors are causing the individual’s circadian rhythm to be out of phase with the environmental demands. This chapter covers the nosological classification and definitions based on the International Classification of Sleep Disorders, Third Edition, and also provides epidemiological data for these circadian rhythm sleep-wake disorders. For many of these disorders, prevalence, sex, and age distribution are unknown.

Summary by: 
Bjørn Bjorvatn (2021). F. Circadian Rhythm Sleep Disorders 1. Nosological classification, definitions, and epidemiology. In Bassetti, C., McNicholas, W., Paunio, T., & Peigneux, P. (Eds.). Sleep Medicine Textbook (2nd ed., pp. 435-440). Regensburg: European Sleep Research Society.

To be continued next week Friday with Shift work, Delayed sleep-wake phase disorder and Non-24-hour sleep-wake disorder. Stay tuned…

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