James Geering April 30, 2019 Episode 196 - Rachel Markwald James Geering April 30, 2019 Rachel Markwald is a Naval sleep researcher at the Department of Warfighter Performance in San Diego. We discuss the connection between sleep deprivation and health, cognition, mental health, stimulant use, sleep hygiene, O2X and much more. Recommended Book:Why We Sleep - Matthew WalkerRecommended Movie:Theranos