Incidence and Types of Nightmare
Studies of dreams have estimated that about 75% of dream content or emotions are negative.
One definition of "nightmare" is a dream which causes one to wake up in the middle of the sleep cycle and experience a negative emotion, such as fear. This type of event occurs on average once per month. They are not common in children under 5, but they are more common in young children (25% experiencing a nightmare at least once per week), most common in teenagers, and common in adults (dropping in frequency about one third from age 25 to 55).
Fearfulness in waking life is correlated with the incidence of nightmares.
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