Circadian Rhythms Help Guide Waste From Brain

This shows a girl sleepingDuring wakeful periods, the glymphatic system diverts cerebrospinal fluid to lymph nodes in the neck. The CSF may act as a “fluid clock” that helps initiate the body’s infection-fighting capabilities during the day. Astrocytes in the suprachiasmatic nucleus may serve to control CSF through the central nervous system. Communication between astrocytes in different brain regions may optimize the glymphatic system’s function as we sleep.