What is the Difference Between REM and Deep Sleep? REM (Rapid Eye Movement) sleep and deep sleep are two distinct stages of the sleep cycle, each playing a crucial role in physical and mental health. The primary difference lies in their functions and brain activity. Deep sleep, also known as slow-wave sleep, occurs earlier in the night and is essential for physical restoration, immune function, and tissue repair. During this stage, brain waves are slow and synchronized, and the body is in its most relaxed state.
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