Night terrors typically start between ages 3 and 10, with most children experiencing their first episode during the preschool or early elementary years. The peak prevalence falls between ages 5 and 7, though some children begin having episodes as young as 18 months. Somewhere between 1% and 18% of children experience night terrors at some point during childhood, and the vast majority outgrow them by age 12.
Why This Age Range
Night terrors happen during the deepest stage of non-REM sleep, the heavy, dreamless sleep your child falls into during the first few hours of the night. In young children, the brain circuits responsible for smoothly transitioning between deep sleep and lighter sleep stages are still maturing. When those circuits misfire, the child gets stuck in a partial arousal, where parts of the brain wake up while others remain deeply asleep. The result is a child who appears terrified, may scream or thrash, but is not actually conscious and won’t remember the episode.
Brain imaging studies have shown that during these episodes, the areas responsible for processing fear and emotion activate while the parts of the brain responsible for full wakefulness stay offline. The body’s stress response system kicks in as though reacting to a threat, even though there’s nothing wrong. It’s essentially a false alarm firing inside a sleeping brain. This is why your child may look panicked, have a racing heart, and sweat heavily, yet have no memory of it the next morning.
Night Terrors vs. Nightmares
Parents often confuse night terrors with nightmares, but they’re fundamentally different events happening at different times of night and in different stages of sleep. Night terrors typically occur in the first half of the night, during the deepest sleep. Nightmares happen during REM sleep and are most common in the early morning hours. A child waking from a nightmare will be alert, able to describe what scared them, and may want comfort before falling back asleep. A child in a night terror is not truly awake, won’t respond to you normally, and will have no recollection of the event.
The distinction matters because the two call for very different responses. With nightmares, you comfort and reassure. With night terrors, trying to wake or restrain your child can actually prolong the episode or increase their confusion. The best approach is to stay nearby, make sure they can’t hurt themselves by falling out of bed or hitting furniture, and wait for the episode to pass on its own, usually within a few minutes.
Common Triggers
Even within the typical age window, night terrors don’t happen every night for most children. Specific triggers tend to bring them on:
- Sleep deprivation. A skipped nap, a late bedtime, or a disrupted sleep schedule is one of the most reliable triggers. Overtired children spend more time in deep sleep, which increases the chance of a partial arousal.
- Fever or illness. Being sick changes sleep architecture and can push a child into deeper, more fragmented sleep.
- Stress or emotional tension. A new school, family changes, or general anxiety can increase episode frequency.
- Obstructive sleep apnea. Children who snore heavily or have enlarged tonsils may experience more disrupted deep sleep, raising the risk.
Addressing these triggers is often the most effective way to reduce episodes. Keeping a consistent bedtime, ensuring your child gets enough total sleep for their age, and managing stress can make a noticeable difference without any medical intervention.
When Children Outgrow Them
Most children stop having night terrors by around age 12, as the brain’s sleep regulation systems fully mature. The transition tends to be gradual. Episodes become less frequent over months or years before stopping entirely. By the teen years, the vast majority of children who had night terrors no longer experience them.
A small percentage of people do continue to have sleep terrors into adulthood. Adult-onset cases are less common and more likely to be associated with other sleep disorders, significant stress, or alcohol use. Adults who begin having episodes for the first time, without a childhood history, may benefit from a sleep evaluation to rule out underlying causes.
What Warrants a Medical Evaluation
Occasional night terrors in a child between ages 3 and 10 are a normal part of development. However, episodes that happen frequently, don’t decrease over time, cause a safety risk (such as a child leaving the bed and walking into dangerous areas), or significantly disrupt household sleep may warrant a conversation with your child’s pediatrician. A sleep study can help rule out conditions like sleep apnea that might be fragmenting deep sleep and triggering episodes. In most cases, though, reassurance and attention to sleep hygiene are all that’s needed while your child’s brain catches up.