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Letters to Nature
Nature 229, 261 - 262 (22 January 1971); doi:10.1038/229261a0

Concentrations of Plasma Testosterone in Normal Men during Sleep

J. I. EVANS*, A. W. MACLEAN*, A. A. A. ISMAIL & D. LOVE

*Sleep Laboratory, Department of Psychiatry, University of Edinburgh
MRC Clinical Endocrinology, Research Unit, Edinburgh

IN man, several studies1,2 have demonstrated diurnal variation, with a morning peak, in plasma testosterone—the most potent naturally occurring androgen. The origin of this variation is not known.

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