Quality sleep includes the Rapid Eye Movement (REM) phase and the Non-Rapid Eye Movement phase; both are required if we want to be able to learn. Sleep directly affects cerebral changes responsible for learning and memory functioning. (Learning could be defined as a way of forming memory.) Also, studies have shown that a person can demonstrate knowledge only when they’ve had more than six hours of sleep. The brain needs time to arrange new information into the right places, and without this required time, information is not properly encoded into memory circuits.