SWS, or Slow Wave Sleep, is also known as deep sleep or restorative sleep. Other synonyms for SWS include Delta sleep, NREM sleep, non-rapid eye movement sleep, and stage 3-4 sleep. These terms refer to the phase of the sleep cycle characterized by slow brain waves, relaxed muscles, and reduced heart rate and breathing. SWS is crucial for physical and mental regeneration, including tissue repair, memory consolidation, and hormone regulation. Sleep disorders such as insomnia or sleep apnea can disrupt the quality and quantity of SWS, leading to fatigue, irritability, and health problems. Understanding the different synonyms for SWS can help people identify and address sleep-related issues effectively.