# What Happens to Testosterone When You Don't Get Enough Sleep? We Have Some New Answers
Sleep deprivation tanks testosterone levels, and new research pinpoints exactly which sleep stage matters most for hormone production.
Scientists have long known that poor sleep hurts testosterone, but the specific mechanism remained fuzzy. Recent studies reveal that rapid eye movement (REM) sleep plays the central role. During REM sleep, the brain cycles through vivid dreams while the body relaxes and testosterone production surges. When you skip REM sleep or get insufficient sleep overall, testosterone dips significantly.
For men and teens especially, this matters. Testosterone supports muscle development, bone density, mood regulation, and sexual function. Men who sleep five hours instead of eight see testosterone drops of 10 to 15 percent, according to research published in JAMA. One study in the Journal of the American Medical Association tracked healthy men and found that each additional hour of sleep gained corresponded with a measurable testosterone increase.
The connection extends beyond single nights. Chronic sleep loss compounds the problem. After just one week of poor sleep, testosterone levels decline noticeably. After months, the effects accumulate, contributing to low energy, reduced muscle mass, and depression.
Parents should recognize this applies to their teens and young adult children too. Adolescents need eight to ten hours nightly, partly because their bodies rely on sleep-driven hormone production for growth and development. School start times that force earlier wake-ups conflict with teenage circadian rhythms, potentially suppressing testosterone when it matters most.
The fix sounds simple but requires consistency. Getting seven to nine hours of quality sleep nightly preserves testosterone production. This means protecting REM sleep specifically, which researchers say takes up about 20 to 25 percent of total sleep time for adults.
Families benefit when parents model good sleep habits. Putting phones away an hour