Lucid dreams and nightmares
What is a nightmare really? Is it different from a scary dream? Not really. A nightmare is a disturbing dream that causes the dreamer to wake up feeling anxious or frightened. The content of the dream is easily recalled, and while the plot may seem silly in the clear light of day (being pursued by a neon-colored Frankenstein, riding in a car with no wheels) the strong emotions are all too real, and may stay with the dreamer for several days.