Night Terrors

Night terrors (sleep terrors) differ fundamentally from nightmares. Nightmares occur during REM sleep and are remembered as bad dreams. Night terrors arise during arousal from deep non-REM (stage 3) sleep, usually in the first third of the night, and produce dramatic physical responses — sitting up, screaming, thrashing, sometimes sleepwalking — while the sleeper stays in a non-REM state and typically has no memory of the episode on waking. They are most common in children aged 3–12, with prevalence estimates around 1–6%, and usually resolve naturally by adolescence. In adults they appear less often (roughly 2%) and are associated with stress, sleep deprivation, fever, alcohol, certain medications (notably SSRIs and sedatives), or untreated obstructive sleep apnea. The episode is almost always more distressing for witnesses than for the person experiencing it. Folklore traditions in many cultures attributed night terrors to nocturnal demons — the Latin *incubus*, the Anglo-Saxon *mare*, the Japanese *kanashibari* — and the term 'nightmare' itself comes from this lineage. Modern sleep medicine treats them as a parasomnia, not as a symbol-bearing experience like REM dreams.

Descriptions of intense night-time fear episodes appear throughout pre-modern medical literature — Hippocratic texts (5th–4th century BCE) note them, and Renaissance physicians treated them under the *incubus* heading. The first systematic clinical separation from ordinary nightmares emerged in the 19th century: French physician Émile Brillon described *terreurs nocturnes* in children in the 1880s. Psychoanalyst Ernest Jones linked them culturally to incubus and succubus legends in *On the Nightmare* (1931). Modern classification dates to the development of sleep-stage EEG in the 1950s–60s, when researchers Roffwarg, Muzio and Dement and later Anthony Kales identified the specific non-REM arousal pattern that distinguishes night terrors from REM nightmares; the disorder was formally codified in the International Classification of Sleep Disorders (ICSD-1, 1990).

For children: keep a consistent sleep schedule, reduce evening stimulation, and ensure adequate sleep — overtiredness is the most common trigger. Don't try to wake the child during an episode; sit nearby and make the area safe. If episodes recur at the same time each night, scheduled awakening (gently rousing the child 15–30 minutes before the usual onset for a week or two) has clinical support. For adults: address sleep hygiene and stress first, and ask a sleep specialist about a polysomnogram if episodes happen weekly or longer than a few months — undiagnosed sleep apnea is a common driver. Mark Pressman's *Automatic Behavior in Sleep* and the American Academy of Sleep Medicine's online resources are reliable starting points.