Every 20 seconds, a wave of fresh cerebrospinal fluid rolls into the sleeping brain. These slow, rhythmic blasts, described for the first time in the Nov. 1 Science, may help explain why sleep is so ...
A. The drawing shows intracranial upstream lymphatic regions #1, #2, and #3 that drain through the nasopharyngeal lymphatic plexus (NPLP) en route to medial deep cervical lymphatics and deep cervical ...