What is the primary characteristic of REM sleep?

The primary characteristic of REM (Rapid Eye Movement) sleep is that it is the sleep stage associated with dreaming. During this phase, brain activity increases significantly, resembling that of waking states, and most vivid dreams occur at this time. The presence of rapid eye movements is a key feature, along with physiological changes such as increased heart rate and irregular breathing.

This stage of sleep plays an important role in memory consolidation and emotional processing, making it crucial for cognitive functioning. Understanding REM sleep’s role in dreams can provide insight into its importance for mental health and well-being. This contrasts with other sleep stages, which are typically characterized by slower brain waves and less vivid or memorable experiences.