Rüya, or dream, refers to a series of thoughts, images, and sensations that occur during sleep. Dreams can happen during the REM (Rapid Eye Movement) stage of sleep, when brain activity is high and resembles that of being awake. They can vary in content, ranging from mundane daily experiences to fantastical scenarios. Dreams have been a subject of interest in various fields, including psychology, neuroscience, and literature. Some theories suggest that dreams help process emotions and memories, while others view them as a way for the brain to solve problems. Cultural interpretations of dreams also vary widely across different societies.