Sleep follows a regular cycle each night. The EEG pattern changes in a predictable way several times during a single period of sleep. A dream is a story that a person watches or appears to take part in during sleep. Dreams are imaginary but are related to events in the dreamer's life. They seem real while taking place.
Some dreams are nice and some are scary, called a nightmare.
This project was good for me because when someone asks me about it I will know. I knew nothing about it. If I had more time I would see an electroencephalograph. Sleep Thieves . The Complete Book of Sleep .