Sleep is an active physiological process, one in which your body is busy carrying out vital activities, while you are unconscious. While asleep your body alternates between two forms of sleep: rapid eye movement, or REM, and non-REM sleep. This cycle repeats several times throughout the night. While REM sleep provides the energy to the brain that supports it during waking hours and is necessary for restoring the mind, stages 3 and 4 of non-REM sleep, known as slow-wave or deep sleep, are essential for restoring the body. Even their names, slow-wave versus rapid eye movement, are indicative of their different healing natures.
Benefits of Sleep and Growth Hormone