During which stage of sleep does dreaming primarily occur?

Dreaming primarily occurs during REM (Rapid Eye Movement) sleep, which is characterized by increased brain activity and vivid visual dreams. This stage of sleep is identifiable by rapid movements of the eyes, increased heart rate, and heightened brain activity resembling that of wakefulness. During REM sleep, the brain processes information and emotions, contributing to memory consolidation and creative thinking. It is during this stage that the majority of dreams—often intense and elaborate—take place, making it distinct from other sleep stages, where dreams may be less vivid or even absent. The unique characteristics of REM sleep underscore its significance in the sleep cycle and overall mental health.