Why Do My Dreams Seem So Real that I Wake Up Crying or Laughing?

Because your brain is just as active when you dream as when you’re awake, says Dr. Barrett. In fact, some areas of your brain—like the occipital lobe, which processes images, and the amygdala, which regulates emotions—are even
more active when you’re dreaming, “which is why a dream can seem so vivid and evoke so much emotion,” says Dr. Barrett.

Pay attention to any negative emotions your dream evokes, especially if they stay with you for the rest of the day, advises Tore Nielsen, PhD, professor of psychiatry and director of the Dream and Nightmare Laboratory at the University of Montreal. “Think of the most recent time you felt the way you did in your dream.

Upon reflection, you may realize that you felt that way when you argued with your husband recently, or when you ran into someone who was rude. It usually doesn’t take much digging to figure out the source of that emotion, and doing so can help you get closure.”

Source