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SUN, 18 OCT · 101 ITEMS
"Scientists discover how deep sleep builds muscle, burns fat, and boosts the brain" — Science Daily (all) · Science & Medicine
Researchers report that deep, slow-wave sleep activates a that triggers the release of , which in turn drives muscle repair, fat metabolism, and processes that support brain function. The finding also reveals a two-way : growth hormone released during feeds back on brain circuits to help regulate restorative sleep. The evidence comes from studies in mice, so while the mechanism is clear in animal models, its full translation to humans is still being worked out.
The underlying claim rests on a peer-reviewed animal study, reported via UC Berkeley's research news and picked up by Science Daily; the given link is a press summary rather than the paper itself, so the reporting is one step away from the primary source. The causal role of the sleep–growth-hormone loop is demonstrated in mice, but human benefits are inferred rather than proven.
Not genuinely new: the recirculation year is 2025, meaning the underlying study dates from 2025 and is being re-reported; the current Science Daily story is dated 2026-10-17.