Nightmares Health Article

Definition

Nightmares are a type of sleep disruption, or parasomnia, characterized by frightening psychological content. Nightmares provoke a feeling of imminent physical danger with a sensation of being trapped or suffocated. These frightening dreams occur during rapid eye movement sleep (REM), or dream-time sleep, and trigger a partial or full awakening. Nightmares are a universal human experience occurring throughout the lifespan. They are especially common in early childhood and involve activation of the limbic brain, particularly the area that mediates negative emotion.

Description

Nightmares are greatly influenced by the particular stressors and anxieties present in the child's waking life. Typical childhood nightmares include dreams of abandonment; of being lost; of falling; or being chased, bitten, or eaten by a monster or hostile animal. Dream researchers have observed a developmental progression in the content and frequency of children's nightmares. A two-year-old dreamer may recall a fearful dream, but be unable to give form to the source of the threat. By the age of five, the frightened young dreamer may identify the attacker as a monster or wild animal. Older children who have developed more of an understanding of real-life dangers report dreams of pursuit by mean or bad people.

Children gradually develop the ability to understand the difference between dreams and reality. Very young children have great difficulty believing that the dream is not real. By three to four years of age, however, most children can distinguish between the nightmare content and their waking reality.

When a child is awakened by a nightmare she will soon become fully alert and able to remember the scary dream in elaborate detail, expressing emotions appropriate to the dream content. The frightened child will resist returning to bed and often seek the comfort and reassurance of a parent or caretaker. Nightmares are different than the non-dream sleep disturbance known as a night terror, which causes only a partial arousal from deep sleep and occurs during the first period of sleep known as slow-wave sleep (SWS). A child experiencing a night terror will be difficult to awaken or comfort, will not recognize her parent or caretaker, and will usually have no memory of the terrifying emotions that caused the sleep disturbance.

Demographics

Although infants spend most of their sleep time in the REM stage where dreams are known to occur, there is no reliable way to determine if dreaming actually takes place prior to the development of language and the reflective ability to think in images. Sleep researchers and developmental psychologists generally agree that nightmares first occur in children from 18 months to two years of age. By age three, more than half of all children will report having experienced a nightmare. The incidence of these frightening dreams increases considerably in elementary school children.

In a study of the dreams of four- to 12-year-old children published in the Journal of Clinical Child Psychology in 2000, researchers found that 67.7 percent of four to six year olds, 95.7 percent of seven to nine year olds, and 76.3 percent of ten to 12-year olds reported having had a nightmare experience. Nightmares are common throughout childhood, changing somewhat in content and frequency as children move through different developmental phases and acquire more skills to cope with the changing realities and stresses in their lives.

Causes and symptoms

Childhood nightmares are a normal maintenance function of the developing brain. They are a means of integrating recent and past learning and of establishing psychological equilibrium. Children who have not yet developed sufficient coping mechanisms to deal with many normal childhood fears and problems may feel overwhelmed and insecure. These distressing emotions provide the basis for nightmares. Common stressful events include moving to a different neighborhood or school, encountering a schoolyard bully, watching a horror movie or a violent television or video program, the birth of a sibling, ongoing conflict with siblings, parental marital problems, or any of numerous other stressful situations that may add to a child's sense of vulnerability or powerlessness.

Nightmares may increase and intensify following particularly traumatic events such as the death of a parent, a sibling, or other loved one; parental divorce or separation; an injury, illness, or other medical crises; or witnessing or being subjected to physical or verbal violence or sexual abuse. Children who have been traumatized may suffer ongoing post-traumatic stress and express it through recurring nightmares.

Certain medications used to treat asthma, allergies, and seizures can be a causal factor in the onset of sleep disturbances and nightmares. Abrupt withdrawal from drugs or medications, including barbiturates and benzodiazepines, can also induce these sleep disturbances. Illness with high fever may bring about delirium with frightening episodes of nighttime awakening. The following behaviors are usually present in a normal nightmare episode:

• Child awakens during the last third of her sleep period.
• Child is frightened and becomes fully alert.
• Child can describe the frightening dream in detail.
• Child seeks and responds to comfort and reassurance from a parent or caretaker.
• Child fears a recurrence of the frightful dream and may resist a return to bed.