Non-Rapid Eye Movement Sleep, or NREM sleep, is a phase of sleep characterized by the absence of rapid eye movements. It is divided into three stages, ranging from light sleep to deep sleep. During NREM sleep, the body undergoes various restorative processes, including tissue growth and repair, immune system strengthening, and energy conservation. This type of sleep plays a crucial role in overall health and well-being. NREM sleep is essential for memory consolidation, allowing the brain to process and store information from the day. It typically occurs in cycles throughout the night, alternating with Rapid Eye Movement (REM) sleep, which is associated with dreaming.