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If nightmares cause concerns about sleep disturbance or underlying conditions, consider seeing a doctor. The doctor may refer you to a sleep specialist or a mental health professional.
Keeping a sleep diary for two weeks before your appointment may help your doctor understand more about your sleep schedule, factors affecting your sleep and when nightmares occur. In the morning, record as much as you know of bedtime rituals, quality of sleep, and so on. At the end of the day, record behaviors that may affect sleep, such as sleep schedule disruptions, alcohol intake and any medications taken.
You may want to bring a family member or friend along, if possible, to provide additional information.