Brain Health

Scientists Map Sleep Circuit That Controls Growth Hormone and Muscle Building

Scientists at UC Berkeley have mapped the brain circuits that control growth hormone release during deep sleep, solving a long-standing puzzle about why poor sleep leads to lower hormone levels. The research reveals a feedback loop where deep sleep triggers growth hormone release from the hypothalamus, which then activates the locus coeruleus brain region controlling alertness and cognitive function. This discovery explains how sleep actively rebuilds the body by strengthening muscles, supporting bone growth, and helping burn fat. The findings could lead to new treatments for sleep disorders linked to metabolic diseases like diabetes and neurological conditions including Parkinson's and Alzheimer's.