In this episode, Todd Wilkowski and Mike Beecher discuss sleep, its importance and how it relates to optimal health. Phases of sleep, REM cycles, and diseases related to a lack of sleep (Heart Disease, Diabetes, Cancer & Hallucinations). The optimal number of hours of sleep, naps and napping, data retention and sacrificing sleep, sleep cycles, and sleep related to the immune function is discussed (Cortisol, Melatonin, Human growth hormone (HGH), Prolactin, & T-Cells). Todd and Mike also review the latest wearable technology (OURA ring, Apple watch, Whoop strap, & Withings Pad). Parasympathetic and sympathetic nervous system, Hacks for better sleep, blue light blocking glasses, circadian rhythm, ideal bedroom temperature, and caffeine and alcohol effects on sleep are also covered.