Kid's Health

What Are Night Terrors?

Most parents have comforted their child after the occasional nightmare. But if your child has ever experienced what's known as a night terror (or sleep terror), his or her fear was likely inconsolable, no matter what you tried.

A night terror is a sleep disruption that seems similar to a nightmare, but with a far more dramatic presentation. Though night terrors can be alarming for parents who witness them, they're not usually cause for concern or a sign of a deeper medical issue.

During a typical night, sleep occurs in several stages. Each is associated with particular brain activity, and it's during the rapid eye movement (REM) stage that most dreaming occurs.

Night terrors happen during deep non-REM sleep. Unlike nightmares (which occur during REM sleep), a night terror is not technically a dream, but more like a sudden reaction of fear that happens during the transition from one sleep phase to another.

Night terrors usually occur about 2 or 3 hours after a child falls asleep, when sleep transitions from the deepest stage of non-REM sleep to lighter REM sleep, a stage where dreams occur. Usually this transition is a smooth one. But rarely, a child becomes agitated and frightened — and that fear reaction is a night terror.

During a night terror, a child might suddenly sit upright in bed and shout out or scream in distress. The child's breathing and heartbeat might be faster, he or she might sweat, thrash around, and act upset and scared. After a few minutes, or sometimes longer, a child simply calms down and returns to sleep.

Unlike nightmares, which kids often remember, kids won't have any memory of a night terror the next day because they were in deep sleep when it happened — and there are no mental images to recall.