A Toxic Dream is usually a very realistic, upsetting dream that is most likely to occur when your body's cleansing system is overloaded during sleep. They are usually terrible nightmares and their purpose is often simply as a signal that you went to bed in a physically toxic state. These dreams can result from a number of factors the day before, including:
Eating refined carbohydrates (sugar, white flour), processed or junk food, additives or preservatives.
Eating any foods within 2 hours before going to bed.
Ingesting drugs or other substances that stress the body.