Does sleep affect testosterone?
Yes. Most testosterone is produced during sleep, especially REM. Sleep restriction below ~5 hours suppresses morning testosterone within a week. Sleep apnea independently lowers testosterone.
Full answer
The majority of daily testosterone production occurs during sleep, with peak release tied to REM cycles. Sleep restriction below approximately 5 hours per night demonstrably suppresses morning testosterone within a week in healthy young men. Obstructive sleep apnea independently lowers testosterone through hypoxic and HPA-axis effects. Sleep is therefore the foundational lever under any hormone optimization plan. Sleep evaluation (including apnea risk) is part of every assessment, and apnea is referred for evaluation when risk is elevated.
Educational. Not a substitute for individualized provider review.
- Methodology — Primary source · oMeds
- Reviewed by Dr. Laura Purdy, MD, MBA · Clinical Director, oMeds · Last reviewed 2026-06-03