Endocrinology of sleep

A. Steiger

Published 2021 in Reference Module in Neuroscience and Biobehavioral Psychology

ABSTRACT

The simultaneous assessment of the electrophysiological and neuroendocrine activity during sleep by the sleep electroencephalogram (EEG) and by the collection of hormone profiles respectively showed a bidirectional interaction between the non-rapid eye movement (non-REM)–REM cycle and nocturnal hormone secretion. Certain hormones (neuropeptides and neuroactive steroids) participate in sleep regulation. A reciprocal interaction of the sleep-promoting peptide growth hormone-releasing hormone (GHRH) and the sleep-impairing corticotropin-releasing hormone (CRH) plays a key role in sleep regulation. Besides GHRH, galanin, ghrelin, and neuropeptide Y also promote sleep, at least in male subjects. In contrast, somatostatin is another sleep-impairing endogenous substance. The influence of peptides on sleep depends on age, sex, and time of administration. For example, GHRH impairs sleep in women, opposite to its effects in men. Vasoactive intestinal polypeptide affects the duration of non-REM and REM periods. In addition to peptides, steroids are involved in sleep regulation. GABA A receptors are targets of various neuroactive steroids exerting specific effects on sleep EEG. Cortisol appears to promote REM sleep. Sleep EEG changes in postmenopausal women and the beneficial effect of estrogen and progesterone replacement therapy suggests a sleep-promoting effect of these hormones.

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