Differential effects of hydrocortisone, fluocortolone, and aldosterone on nocturnal sleep in humans

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Abstract
Previous experiments have suggested that sleep processes are sensitive to influence of corticosteroids. The present experiment was designed to compare effects of three different corticosteroids on human sleep: fluocortolone (a synthetic pure glucocorticoid), cortisol which possesses glucocorticoid and mineralocorticoid activity, and aldosterone (the major mineralocorticoid). Ten male adult subjects were tested in four experimental nights according to a double-blind latin-square design under conditions of either 1.0 mg of aldosterone, 20 mg of fluocortolone, 80 mg of hydrocortisone, or placebo. Substances were administered orally (fluocortolone, 23.00 h) or infused iv throughout the night (hydrocortisone, aldosterone) starting at 23.00 h. Hydrocortisone and fluocortolone induced a substantial reduction of rapid eye movement sleep. Hydrocortisone increased slow wave sleep activity. No such effect was observed after fluocortolone. Effects on sleep processes of aldosterone, in general, seemed to be negligible. The results demonstrate differential effects of synthetic glucocorticoid, cortisol, and aldosterone on sleep in humans, which may be attributed to the heterogeneity of corticosteroid receptors in the brain.

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