Slow-wave sleep (SWS) is a deep stage of non-REM sleep characterized by slow brain waves, reduced heart rate, and relaxed muscles. It typically occurs in the first half of the night and is essential for physical restoration and recovery. During this phase, the body repairs tissues, builds bone and muscle, and strengthens the immune system. SWS plays a crucial role in memory consolidation, helping to process and store information learned during the day. It is also linked to the release of growth hormone, which aids in growth and development. Overall, slow-wave sleep is vital for overall health and well-being.