Grumpy Old Geeks Topics Sleep and memory Topic Sleep and memory 5 mentions in 2 episodes The hosts discuss research on sleep, memory formation, and the clearance of waste from the brain. Mentions 30: The American Dream 2.0 Oct 19, 2013 9:12 another article about sleep strengthening memory 9:45 your day was being played back in reverse 10:11 one of the theories on why we need sleep is that it's garbage collection 25: The Breakout Viral Podcast of the Year Sep 15, 2013 11:26 there is a correlation between sleep and memory 12:28 I generally will only sleep five to six hours a night.