What are night terrors?

These mysterious disturbances happen during deep, non-dreaming sleep. A child in this state will cry, whimper, flail, and even bolt out of bed. Though his eyes may be wide open, he's not awake and isn't aware of your presence.

Night terrors occur in 3 to 6 percent of young children. They can start as early as 18 months, but typically occur in children beginning at age 4 or 5.

How are night terrors different from nightmares?

Nightmares happen during rapid eye movement (REM) or dream sleep. A child who's had a nightmare is likely to have a fairly clear idea of what scared her, though she probably won't be able to articulate her fright until she's about 2. She may also be afraid to fall back asleep, and in the morning, she'll probably remember that she had a bad dream.

On the other hand, night terrors occur during non-REM sleep. They're not scary dreams, but more like a sudden fear reaction that happens as your child goes from one sleep phase to another. They can last several minutes or longer.

Your child won't remember a night terror the next day because it happened while she was in deep sleep and there are no mental images to recall.

What should I do when my toddler has a night terror?

Of course, your first instinct will be to comfort him, but your efforts will most likely be futile. (Remember, he's not really awake or aware of your presence.) You just have to wait it out and make sure he doesn't hurt himself.

Don't try to shake or startle him awake or physically restrain him – that could lead to more frantic behavior. Keep the lights dim and speak to him in a soft and reassuring voice. In 10 to 30 minutes, your child should calm down, curl up, and fall into a deep sleep again.

Is there anything I can do to prevent night terrors?

There are several steps you can take to reduce the chances that your toddler will have night terrors. First, make sure she's getting enough sleep. Children who go to bed overtired are more likely to experience these sleep disturbances. To avoid fatigue, extend your toddler's nap time, let her sleep a little later in the morning, or put her to bed earlier at night.

Stress can be a factor, so be sure to allow plenty of time for calming bedtime rituals, such as a bath, a song, a book, and lots of cuddling.

Because night terrors usually occur during the first part of the night, you could also try gently rousing your toddler after she's been asleep for an hour or two – about 15 minutes before a typical episode would start. This may alter her sleep pattern enough to avert the night terror.