During which sleep cycle does active dreaming occur?

Active dreaming primarily occurs during Rapid Eye Movement (REM) sleep. This stage of sleep is characterized by rapid movement of the eyes beneath closed eyelids, increased brain activity, and vivid dreams.

During REM sleep, the brain is highly active, similar to wakefulness, and this is when most dreaming happens. The body experiences atonia, a temporary paralysis of the muscles, which prevents individuals from acting out their dreams. This unique combination of brain activity and muscle relaxation contributes to the vividness and often bizarre nature of dreams experienced during this stage.

In contrast, Non-REM sleep, light sleep, and deep sleep stages are associated with different brain wave patterns and functions, such as physical restoration and memory consolidation, rather than the vivid dreams typical of REM sleep.