The Science & Crucial Importance of Sleep with Professor Matthew Walker, Shawn Stevenson, National Geographic & Dr. Mercola
Summary from Professor Matthew Walker – 2 stages which are REM (Rapid Eye Movement) and Non-REM. REM is also known as dream sleep. Non-REM is divided into 4 stages. The deep stages 3 and 4 is where body replenishment, cardio, metabolism, etc happens. Your body resists going into these stages when they’re in a foreign … Read more