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What Causes Nightmares?

Exactly how or why nightmares occur is not known. However, being too tired, not getting enough sleep, having an irregular routine for sleep, and having stress or anxiety may all increase the risk of having nightmares. Nightmares can be related to the child’s stage of development. Most nightmares are a normal part of coping with changes in our lives. For children, nightmares could be related to events such as starting school, moving to a new neighborhood, or living through a divorce or remarriage.

Some genetic and psychological factors can also lead to nightmares. About 7% of children who have nightmares have a family history of nightmares (their brother or sister or parents had nightmares). Nightmares are more common in some children, including those with mental retardation, depression, and certain diseases that affect the brain. Nightmares may also be associated with fevers. Some medicines can cause frightening dreams, either during treatment or after the treatment has stopped. Conflicts and stress that happen during the day can affect a child’s sleep and lead to nightmares. Nightmares can also occur after a trauma. These nightmares may indicate post-traumatic stress disorder.