Grumpy Old Geeks Topics Brain fluid movement during sleep Topic Brain fluid movement during sleep 2 mentions in 1 episode The speakers describe research observing a wave of fluid in the brain during deep sleep. Mentions 390: I’ve Fallen and I Can't Get Up Nov 2, 2019 58:20 when you go into deep, deep sleep, a wave of fluid comes through your brain 58:45 putting people to sleep in an MRI machine with ... an EEG cap