Yawning isn’t just a sign you’re bored—it may be your brain quietly taking out the trash.
A new study suggests the familiar, uncontrollable reflex does far more than stretch your jaw and fill your lungs. It may actively help flush waste from the brain, regulating the flow of cerebrospinal fluid in ways scientists are only beginning to understand.
Researchers publishing in Respiratory Physiology & Neurobiology used MRI scans on 22 participants to track what actually happens inside the body during a yawn. What they found surprised them.
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