Night Terrors vs Nightmares in Babies and Toddlers: What Is the Difference?

Night terrors and nightmares are completely different events that happen during different stages of sleep, produce different symptoms, and require different responses. They are often confused because both involve a distressed child at night, but understanding the distinction changes how you handle them — and how worried you need to be.

Here is the key difference at a glance:

• Night terrors happen during deep non-REM sleep (typically in the first third of the night, 1 to 3 hours after falling asleep). Your child appears terrified — screaming, thrashing, eyes open — but they are not awake and will not remember it
• Nightmares happen during REM sleep (typically in the second half of the night or early morning). Your child wakes up fully, is scared, remembers the dream, and wants comfort

The distinction matters because the response is opposite. During a night terror, your child does not know you are there and cannot be comforted. During a nightmare, your child desperately wants you there and needs reassurance. Trying to wake a child during a night terror can make it worse. Leaving a child alone after a nightmare can increase their fear.

Both are normal parts of childhood sleep. Neither indicates psychological problems, bad parenting, or anything medically wrong with your child — in the vast majority of cases.

Night terrors (also called sleep terrors) are partial arousal parasomnias — episodes where the child becomes stuck between deep sleep and wakefulness. The brain has partially woken up, triggering the body's alarm system, but consciousness has not followed. The result is terrifying to watch but not harmful to the child.

During a night terror, your child may:

• Scream, shout, or cry inconsolably
• Sit up, thrash, or kick violently
• Have their eyes wide open — but they are not seeing you
• Appear terrified, panicked, or confused
• Sweat, have a racing heart, and breathe rapidly
• Push you away or not respond when you try to comfort them
• Not recognise you — they may look straight through you

Episodes typically last 5 to 20 minutes and end as suddenly as they began. The child usually settles back into sleep without fully waking. In the morning, they will have no memory of the event.

Research suggests that 17 to 21% of children experience night terrors between 12 and 36 months, with some studies suggesting prevalence as high as 35% at 18 months. There is a strong genetic component — if you or your partner experienced night terrors or sleepwalking as a child, your toddler is more likely to have them.

Night terrors typically begin from around 18 months, though some children experience them earlier. They are most common between ages 2 and 6 and are usually outgrown by adolescence.

The most important thing you can do during a night terror is very little. This feels counterintuitive when your child appears to be in extreme distress, but trying to intervene usually makes things worse.

• Do not try to wake your child. Waking a child during a night terror can prolong the episode, increase their confusion, and cause genuine distress — because they will wake disoriented, not understanding why they are out of bed with a panicked parent hovering over them
• Keep them safe. Stay nearby to prevent them from falling out of the cot or bed, hitting their head, or hurting themselves during thrashing. Move objects away from their flailing limbs. If they are in a bed, use bed guards
• Do not restrain them. Holding a child firmly during a night terror can increase their agitation. Stay close, keep them safe, but let the episode run its course
• Wait. The episode will end on its own, usually within 5 to 20 minutes. Your child will either settle back to sleep or wake briefly and be easily resettled
• Do not discuss it the next morning unless your child mentions it. They will not remember, and talking about it can create anxiety about something they did not consciously experience

Night terrors are far harder on the parent than on the child. Watching your toddler scream in apparent terror while being unable to comfort them is deeply distressing. But your child is not suffering in the way it appears — they are not conscious during the episode and will not carry any memory of it. The distress is yours, not theirs.

Nightmares are frightening dreams that occur during REM sleep and cause the child to wake up fully. Unlike night terrors, the child is conscious, aware, and able to tell you (in age-appropriate terms) that something scared them.

Nightmares typically begin from around age 2, when imagination develops enough for the brain to generate vivid, frightening scenarios during sleep. They become more common between ages 3 and 6 as imaginative capacity grows, and most children experience them occasionally.

During and after a nightmare, your child will:

• Wake up crying or calling for you — and recognise you when you arrive
• Be able to describe (at an age-appropriate level) that they had a scary dream — a younger toddler may not have the words but will clearly seek comfort
• Want to be held, cuddled, and reassured
• Remember the dream — possibly vividly, possibly vaguely
• May struggle to go back to sleep, especially if the dream was particularly frightening

Nightmares tend to happen in the second half of the night and early morning (when REM sleep is most concentrated), whereas night terrors happen in the first third. This timing difference is one of the most reliable ways to distinguish between them.

Occasional nightmares are entirely normal and do not indicate that anything is wrong. If your child is having nightmares every night, or if the content of the dreams is consistently disturbing, it may be worth mentioning to your health visitor or GP.

The response to a nightmare is the opposite of a night terror. Your child is awake, scared, and needs you.

• Go to them promptly. Your presence is the most powerful reassurance you can offer. A quick, calm response teaches your child that you are there when they need you
• Comfort and reassure. Hold them, cuddle them, and speak calmly: "You had a scary dream. I am here. You are safe. It was not real." Keep your voice low and steady
• Validate their feelings. Do not dismiss the fear with "it was just a dream" — to a toddler, the experience felt real. Instead: "That sounds really scary. I understand why you are upset. I am right here."
• Stay until they are calm. Rushing the process can increase anxiety. Wait until your child's breathing has slowed, their body has relaxed, and they feel safe enough for you to leave
• Keep the room dark and calm. Avoid turning on bright lights or stimulating activity. A dim nightlight is fine if it helps
• Avoid detailed discussion at 3am. "We can talk about it in the morning if you want to" is perfectly appropriate. Processing the dream is better done in daylight when fear is less powerful

For toddlers who are old enough to understand, a simple ritual can help — "checking" under the bed or behind the curtain, or giving a comforter a "special job" of keeping the scary things away. These rituals work not because the monsters are real but because they give the child a sense of agency and safety.

If nightmares are frequent, consider whether there are daytime sources of anxiety — a change in routine, starting nursery, a new sibling, or exposure to age-inappropriate media. Reducing daytime stress can reduce nighttime fears.

Night terrors are primarily caused by the brain getting "stuck" during the transition from deep slow-wave sleep to lighter sleep. They are not caused by trauma, bad parenting, or psychological disturbance. There is a strong genetic component — they run in families.

However, certain factors are known to increase their frequency:

• Overtiredness: This is the most consistent trigger. A child who has not had enough sleep — missed naps, late bedtimes, disrupted nights — is more likely to experience night terrors. Deep sleep is deeper and harder to transition out of when the child is overtired
• Illness and fever: Being unwell, particularly with a fever, increases the likelihood of night terrors
• Schedule disruption: Changes to routine, travel, clock changes, or inconsistent sleep schedules can trigger episodes
• A full bladder: In older toddlers, needing the toilet during deep sleep can trigger partial arousals
• Genetics: If a parent had night terrors or sleepwalked as a child, the chances are significantly higher

While you cannot eliminate night terrors entirely (especially if there is a genetic predisposition), you can reduce their frequency by protecting your child's sleep:

• Ensure adequate total sleep for their age — overtiredness is the biggest modifiable risk factor
• Maintain a consistent bedtime routine and schedule
• Avoid overtiredness from missed naps or late bedtimes
• If episodes happen at a consistent time each night, some practitioners suggest "scheduled awakening" — briefly and gently rousing your child 15 to 30 minutes before the typical episode time to disrupt the sleep cycle. Discuss this with your GP if episodes are frequent

In most cases, both night terrors and nightmares are normal parts of childhood development and do not require medical attention. However, there are situations where speaking to your GP is appropriate.

See your GP if:

• Night terrors are happening nightly or multiple times per night
• Episodes are lasting more than 30 minutes
• Your child is experiencing unusual movements during episodes that look different from thrashing — jerking, stiffening, or rhythmic movements (these could indicate seizure activity and need investigation)
• Night terrors are persisting beyond age 6 or 7
• Your child is sleepwalking during episodes and putting themselves in danger
• Nightmares are happening every night and significantly disrupting sleep
• Nightmare content is consistently disturbing or seems linked to a specific traumatic experience
• Your child has persistent snoring, mouth breathing, or pauses in breathing during sleep — this could indicate sleep apnoea, which can worsen parasomnias
• You are unsure whether what you are seeing is a night terror, a nightmare, or something else

If you are ever unsure about what is happening with your child's sleep, speaking to your GP or health visitor is always the right call. It is better to check and be reassured than to worry in silence.

For the vast majority of families, night terrors are a phase that passes. They are frightening to witness but not harmful to your child. Nightmares are a normal part of developing an imagination — and your calm, comforting response is the most powerful treatment available.