what type of sleep do you need the most of
Sleep is divided into two broad types: non-rapid eye movement (non-REM or NREM sleep) and rapid eye movement (REM sleep). non-REM and REM sleep are so different that physiologists identify them as distinct behavioral states. Non-REM sleep occurs first and after a transitional period is called slow wave sleep or deep sleep. During this phase, body temperature and heart rate fall, and the brain uses less energy. REM sleep (also known as paradoxical sleep), a smaller portion of total sleep time and the main occasion for dreams (or nightmares), is associated with desynchronized and fast brain waves, eye movements, loss of muscle tone, and suspension of homeostasis.