00:00Why does your body repair itself while you sleep?
00:02A new look inside the brain may help explain it.
00:06Neuroscientists at the University of California, Berkeley, with Stanford colleagues,
00:10recorded brain activity in mice while using light to switch specific neurons on and off.
00:15They focused on the hypothalamus, which holds two kinds of cells,
00:19one that tells the body to release growth hormone and one that suppresses it.
00:24During REM sleep, both types become more active,
00:26and their combined effect still pushes growth hormone out.
00:30During non-REM sleep, the suppressing cells quiet down while the releasing cells ramp up.
00:35So sleep itself drives the hormone.
00:38And here is the twist.
00:39Growth hormone then feeds back to an alertness center in the brainstem
00:43and helps promote waking, creating a loop.
00:46Now the honest part.
00:47This was done in mice and any link to diabetes.
00:50Obesity or brain disease in people is still speculation,
00:53but it is one more reason not to cut your sleep short.
00:57Disclosure.
00:58This video contains stock footage and content created or enhanced using AI-assisted tools.
