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What Causes What

Randomized trial · 2011

Effect of 1 week of sleep restriction on testosterone levels in young healthy men

R. Leproult, E. Van Cauter. JAMA · N=10.

One week of 5-hour nights cut daytime T by 10–15% in young men. Small N, clean design, the right direction of effect. Sleep is not a wellness garnish.

Open sourcedoi:10.1001/jama.2011.710PMID 21632481

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What Causes What. “Effect of 1 week of sleep restriction on testosterone levels in young healthy men.” https://whatcauseswhat.org/papers/p-leproult-2011 (atlas updated 2026-08-31).

https://whatcauseswhat.org/papers/p-leproult-2011