For example, a study found that 47% of college students had at least one nightmare in the past two weeks. It’s normal for both children and adults to have bad dreams and nightmares every now and again. Instead, nightmare disorder involves recurring nightmares that bring about notable distress in their daily life. People who have occasional nightmares don’t have nightmare disorder. Parasomnias include numerous types of abnormal behaviors during sleep. It is a sleep disorder known as a parasomnia. While most people have nightmares from time to time, nightmare disorder occurs when a person has frequent nightmares that interfere with their sleep, mood, and/or daytime functioning. Physical symptoms like heart rate changes or sweating may be detected after waking up as well. Upon waking up from a nightmare, it’s normal to be acutely aware of what happened in the dream, and many people find themselves feeling upset or anxious. Nightmares arise more frequently in the second half of the night when more time is spent in REM sleep. They occur more often during rapid eye movement (REM) sleep, the stage of sleep associated with intense dreaming. Nightmares are vivid dreams that may be threatening, upsetting, bizarre, or otherwise bothersome. This definition helps distinguish nightmares from bad dreams: while both involve disturbing dream content, only a nightmare causes you to wake up from sleep. In sleep medicine, nightmares have a more strict definition than in everyday language. Knowing the differences between bad dreams, nightmares, and nightmare disorder is a first step to addressing the causes of nightmares, starting appropriate treatment, and getting better sleep. It’s normal to occasionally have a nightmare or bad dream, but for some people, they recur frequently, disrupting sleep and negatively impacting their waking life as well. When a bad dream causes you to wake up, it’s known as a nightmare. While dreams can include visions of grandeur and bliss, they can also be scary, threatening, or stressful. Dreaming is one of the most complicated and mysterious aspects of sleep.
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