Nightmares vs Night Terrors Difference: How to Tell Them Apart
By Chester Takau · October 2026
A nightmare is a frightening dream that wakes you up, and you remember it. A night terror is a burst of screaming, thrashing or panic during deep non-REM sleep, and the person usually remembers nothing the next morning. The person having a nightmare wakes up alert and can tell you what scared them. The person in a night terror may sit up with open eyes, look terrified, and still not respond to you, because they are not actually awake. Terrors tend to happen in the first part of the night; nightmares cluster later, when REM sleep is longer.
About the author
Chester Takau is an independent writer researching sleep science and meditation. Content is educational and not a substitute for medical advice.
Nightmare or Night Terror? Episode Checker
Tick everything that matches the episode, then read the result.
General guidance, not medical advice. It describes which pattern an episode resembles; it cannot diagnose anything.
Nightmares vs night terrors side by side
The table is the textbook version. Mayo Clinic, the Sleep Foundation and the NHS all describe the same core split, and it holds up well for most episodes. It gets blurry at the edges, which is where most of the confusion comes from.
My child's eyes are open and they're screaming. Are they awake?
No. This is the feature that frightens parents most. The eyes are open, the face looks terrified, and the child may even say a word or two, but the brain is still in deep sleep and is not taking you in. That is why comforting often changes nothing, and why the child has no memory of it in the morning. Most medical sources, including Mayo Clinic, advise against waking the child, since it can prolong the episode and leave them more disoriented. Stay close, move anything hard or sharp out of the way, block the stairs if they walk, and let it end. Most episodes pass within minutes and the child settles back into sleep.
Can adults get night terrors?
Yes, although they are better known in children. In adults, the triggers worth checking are obstructive sleep apnoea, certain medications, alcohol, and heavy sleep deprivation. A May 2026 case report links night-time episodes of fear and palpitations to heart rhythm problems caused by sleep apnoea, and CPAP reduced them. A SLEEP abstract from May 2026 describes one 42-year-old woman whose night terrors appeared on semaglutide, worsened at 0.5 mg, cleared within 10 days at 0.25 mg and returned when the higher dose was resumed by accident. That is a single case and cannot show the drug caused them, but it is a reason to mention any new medication to your doctor if terrors start after a change. If a partner reports your episodes, they are the ones who will know timing and behavior, since you will not remember.
Why do the prevalence numbers range from 3% to 40%?
The Sleep Foundation cites 30 to 40% of young children having a night terror at some point. Other pediatric sources, including Connecticut Children's, put it at 3 to 6% of US children. Adult estimates run from about 1 to 2% up to 2 to 4%. The sources are not contradicting each other so much as counting different things. One episode ever is very common; a recurring disorder is not. When you read a figure, check which of the two it measures.
What does 2026 research say?
Toddlers with sleep terrors. A June 2026 BMC Psychiatry study compared 48 children aged 2 to 5 who had sleep terrors with 48 matched controls. The terror group woke more often at night (39.6% vs 16.7%) and scored higher for anxiety and behavior problems. They also had lower vitamin D, B12 and folate, but those gaps shrank after adjustment, and the authors call the findings "hypothesis-generating." Treat any article that tells you to give a supplement for night terrors with caution.
Nightmare disorder may not be REM-only. A small June 2026 study in npj Biological Timing and Sleep (26 patients, 32 controls) found weaker coupling between slow brain waves and sleep spindles during non-REM sleep in adults with nightmare disorder. The clean "nightmares are REM, terrors are non-REM" rule is a useful guide, not a law.
THC for PTSD nightmares. A randomized, double-blind Nature Medicine trial from Charité Berlin and partners tested dronabinol in more than 170 people with PTSD and severe nightmares. Over 10 weeks, nightmare severity on a 0 to 8 scale fell 3.7 points on the drug and 2.2 on placebo, and more than a third of the dronabinol group reported no nightmares at the end. The trial did not show a drop in overall PTSD severity. The press summary says there were no severe side effects, while the abstract summary I saw reports serious adverse events in 8.0% of the dronabinol group and 0% on placebo; I did not open the full paper, so check it before drawing conclusions. This concerns nightmares only, not night terrors.
Can nightmares be treated, or do you just wait them out?
Frequent, distressing nightmares can be treated; imagery rehearsal therapy and CBT-based approaches are the usual routes, delivered by a clinician. Researchers at the University of Oklahoma and University of Tulsa published a framework for chronic childhood nightmares in April 2026 (DARC-NESS), built around "nightmare efficacy," a child's belief that they can cope with the dream. It challenges the old view that nightmares cannot be treated or simply fade once the underlying trauma is dealt with. It is a model only, with no outcome data yet. For both nightmares and night terrors, the practical shared basics are a steady sleep and wake time, a calm wind-down in the last hour before bed, and lowering daytime stress. Night terrors also tend to follow sleep loss, so protecting sleep length matters more there.
The neighbors: what else looks like a night terror?
Confusional arousals, sleepwalking and sleep paralysis are close relatives or lookalikes, and REM sleep behavior disorder involves acting out dreams, usually in older adults. The questions that separate them are the same: what stage, how responsive, what do they remember. If the picture does not fit either column of the table, a clinician can sort it out, and a few nights of notes will help them.
The video above, from the IntermountainParents channel (Intermountain Health), covers the difference and what a parent can do, in the same terms as this article. I could not verify its upload date, so check that it is current.
When should I see a doctor?
Common advice is to get checked if episodes happen more than twice a week, if anyone is getting hurt, if the person snores loudly or seems to stop breathing, if they are very sleepy by day, or if nightmares are distressing enough to make someone dread going to bed. A doctor can look for apnoea, medication effects and anxiety. Chester is a writer and researcher, not a clinician, so use this article to prepare for that conversation, not replace it.
Quick answers
Should I wake someone during a night terror?
No. Keep them safe and let it pass. Waking can lengthen the episode.
Why doesn't my child remember screaming last night?
They were in deep sleep during the episode and never fully woke, so no memory formed.
When do kids grow out of night terrors?
Most sources describe them fading through childhood. Persistent or new adult-onset episodes deserve a medical look.
Are night terrors linked to sleep apnoea, stress, fever or medication?
All four are commonly listed as possible triggers, which is why a doctor will ask about each.
Sources: Sleep Foundation, Cleveland Clinic, Mayo Clinic, NHS, Connecticut Children's, BMC Psychiatry 2026, npj Biological Timing and Sleep 2026, Nature Medicine 2026 (press summary), SLEEP 2026 abstract, sleep apnoea case report, University of Oklahoma on DARC-NESS.
Updated October 2026.
Transparency note: This article was researched and written by Chester Takau with AI assistance for research gathering and drafting. All recommendations reflect the author's own editorial judgment.
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