Nightmares are frightening or disturbing dreams that occur during REM sleep causing you to feel terrified or afraid, angry, sad, guilty, anxious or distressed. They usually wake you up and the bad feelings can continue for some time after you’ve awakened. While nightmares are more common among children, about 50% of adults experience them periodically. The most common themes of nightmares in adults are feeling trapped, being lost, being chased, or falling and are usually a re