Dreams are a series of thoughts, images, and sensations that occur involuntarily in the mind during sleep. They can be vivid, imaginative, and often elusive experiences that can range from pleasant to terrifying. Dreams are believed to occur during the rapid eye movement (REM) phase of sleep, and can be influenced by individual experiences, emotions, and subconscious desires. They have long fascinated and puzzled humans, leading to various interpretations and studies. Some believe dreams can offer insights into the unconscious mind and provide guidance, while others see them as mere random brain activity with no inherent meaning.