Nightmares are parasomnias — undesirable experiences that occur during sleep. You've had a nightmare if:

• Your dream wakes you up
• You feel scared, anxious, angry, sad or disgusted as a result of your dream
• You can think clearly upon awakening, and can recall details of your dream
• Your dream occurs near the end of your sleep time
• Your dream keeps you from falling back to sleep easily

When to see a doctor
Occasional nightmares aren't usually a cause for concern. If your child has nightmares, you can simply mention them at a routine well-child exam.

Talk to your doctor earlier if your or your child's nightmares:

• Become more frequent
• Routinely disrupt sleep
• Cause you or your child to fear going to sleep

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Most nightmares occur during rapid eye movement (REM) sleep. You normally go through four to six sleep cycles a night, cycling through the sleep stages in about 90 minutes. Your REM stage lengthens with each cycle, from several seconds in the first cycle to up to an hour in the last. You're more likely to have a nightmare in the last third of your night.

Another disorder can be associated with nightmares. Many other factors can trigger nightmares, including:

• Stress. Sometimes the ordinary stresses of daily life, such as a problem at home or school, trigger nightmares. A major change, such as a move or the death of a loved one, can have the same effect.
• A traumatic event. Nightmares are common after an accident, injury or other traumatic event. Nightmares are prominent in post-traumatic stress disorder.
• Scary books and movies. Reading scary books or watching scary movies, especially before bed, can cause nightmares.
• Bedtime snacks. For some, eating right before bed — and the resulting boost in metabolism and brain activity — leads to nightmares.
• Illness. Sometimes being sick triggers nightmares, especially if the illness is accompanied by a fever.
• Medications. Some drugs — including certain antidepressants, narcotics and barbiturates — can trigger nightmares.

©1998-2009 Mayo Foundation for Medical Education and Research (MFMER). Terms of use.

Occasional nightmares usually aren't a concern, but regularly disrupted sleep can be. It can cause excessive daytime sleepiness, which can lead to difficulties at school or work, or problems with everyday tasks such as driving.

©1998-2009 Mayo Foundation for Medical Education and Research (MFMER). Terms of use.

For children, nightmares tend to decrease by the time they're adolescents. However, if you have concerns about safety or underlying conditions, you may want to see your doctor. Your doctor may refer you to a sleep specialist.

Your doctor also will need to know:

• When the nightmares began
• How often the nightmares occur and what they're about
• Your medical history
• Any medications you're taking or have taken
• Whether you have or have had any other sleep problems
• Whether you have family members with sleep problems

It's a good idea to keep a sleep diary for two weeks before your appointment to help your doctor understand your sleeping pattern. In the morning, you record as much as you know of your or your child's bedtime ritual, quality of sleep, and so on. At the end of the day, you record behaviors that may affect your or your child's sleep, such as caffeine consumption (chocolate and cola count) and any medications taken.

Write down any questions that occur to you before your appointment to ensure you get the answers you seek while with your doctor.

©1998-2009 Mayo Foundation for Medical Education and Research (MFMER). Terms of use.

There are no tests routinely performed for nightmares, but if your or your child's sleep is severely disturbed, your doctor may recommend an overnight sleep study to help determine if the nightmares are connected to another sleep disorder. During the study, technicians monitor your brain waves, heart rate, breathing and movement while you sleep.

©1998-2009 Mayo Foundation for Medical Education and Research (MFMER). Terms of use.

Treatment for nightmares isn't usually necessary. If the nightmares are associated with an underlying medical or mental health condition, treatment is aimed at the underlying problem. If stress or anxiety seems to be contributing to the nightmares, your doctor may suggest stress-reduction techniques, counseling or therapy.

Medication is rarely used to treat nightmares. However, medications that reduce REM sleep or reduce awakenings during sleep may be recommended if you have severe sleep disturbance.

©1998-2009 Mayo Foundation for Medical Education and Research (MFMER). Terms of use.

If you're having nightmares, try some relaxation techniques before bedtime. Take a warm bath, meditate or practice deep breathing. If your child is struggling with nightmares, be patient, calm and reassuring. Sometimes a little creativity helps, too.

• Talk about the dream. Ask your child to describe the nightmare. What happened? Who was in the dream? What made it scary? Then remind your child that nightmares aren't real and can't hurt you.
• Put stress in its place. If your child seems anxious or stressed, talk about what's bothering him or her. Practice some simple stress-relief activities, such as deep breathing.
• Rewrite the ending. Help your child imagine a happy ending for the nightmare. Encourage your child to draw a picture of the nightmare, "talk" to the characters in the nightmare or write about the nightmare in a journal.
• Provide company. Your child might feel more secure if he or she sleeps with a favorite stuffed animal, blanket or other comfort object.
• Enlist a guard. If your child is very young, you might assign a doll or stuffed animal the job of "staying awake" all night to guard against nightmares.
• Brighten up. Use a night light in your child's room. If your child wakes up during the night, the light might be reassuring.
• Open the doors. Leave your child's door open at night so that he or she won't feel alone. Leave your door open, too, in case your child needs comfort during the night.

Safety counts, too. If your child has frequent nightmares, make sure his or her bedroom is safe. Skip the bunk beds, and consider blocking doorways or stairways with a gate in case your child tries to run after he or she wakes up.

©1998-2009 Mayo Foundation for Medical Education and Research (MFMER). Terms of use.