“She slips through the keyhole at night to sit on your chest and steal the breath from your body.”
The mora needs no door. Croatian and wider South Slavic tradition holds that she enters the bedroom through the keyhole or any crack — often, the tales say, in the shape of a fly or a moth — and settles on the sleeper's chest. What follows is documented in every language that has a word for it: the crushing weight, the strangling pressure, the body that will not move. The mora is sleep paralysis given a name, a will, and a grudge.
What makes the Slavic mora distinctive is who she is: not a demon from elsewhere but the soul of a living woman, slipped out of her body in the night — in some tellings a girl fated to become a witch, in others a woman wronged in love or botched at her own baptism. She presses and strangles, sucks blood, tangles hair into elf-locks, and rides horses to a lather in their stalls. Her name is ancient, and it survives as the second half of the English word 'nightmare.'
The Legend
The attack has a fixed script. The mora squeezes through the keyhole, sits on the chest, and presses until the sleeper wakes suffocating, unable to cry out; her entrance, Croatian tellings add, is often marked by something small breaking or falling in the room. Crucially, she must leave by the way she came in — a rule the cunning could exploit, stopping the hole to trap the intruder inside.
Defences were domestic and precise. Vuk Karadžić recorded that people repelled the mora by leaving a broom upside down behind the door, laying a belt on top of the bedsheets, or reciting an elaborate prayer-poem before sleep; children were advised to look to the window, or to turn the pillow and make the sign of the cross on it. In Istrian practice a knife set in the door-lock barred her way, and tales tell of moras trapped in bottles.
The Record
The being is attested startlingly early: the 13th-century Norse Ynglinga saga has King Vanlandi of Uppsala trampled to death in his sleep by a mara — the same creature under its Germanic name. Philology carries her further back still: mora and mare descend from a Proto-Indo-European root associated with crushing and pressing, and the philologist Yeleazar Meletinsky held that Proto-Slavic mara passed into Germanic no later than the 1st century BC.
In the South Slavic zone the ethnography is thick. Croatian and Serbian accounts fix the keyhole entrance and the chest-sitting; the Croatian verb moriti — to torment, to strangle — keeps her name in daily speech. Istrian tradition, recorded alongside a twin figure called the pesaròla, adds vampiric touches: a mora who sucks blood from sleepers, children above all, and remedies running from knives under pillows to avoiding sleeping on one's back.
The Lore
The mora sits inside a wider Slavic system of the wandering double: the witch whose spirit leaves her body in trance, the Polish zmora recognizable by eyebrows joined above the nose, the Russian kikimora. The local rules for who becomes one read like village justice — a jilted bride, a child whose godparent stumbled over the baptismal prayer — misfortune at the start of a life returning as a weight on other people's sleep.
Etymology is her monument. Through Old English mære she survives inside 'nightmare'; through Old French she rides in the French cauchemar; Danish and Norwegian still call a bad dream a 'mare-ride.' Medicine has renamed her experience sleep paralysis, but the clinical description has not improved on the folklore: a weight on the chest, a presence in the room, and the certainty that it came in through the smallest opening the house allows.
Field Notes
- ✦ The folk explanation for sleep paralysis and bad dreams.
- ✦ Placing a broom or knife by the bed was said to ward her off.
- ✦ Etymological root of the '-mare' in 'nightmare'.
- ✦ Must leave by the hole she entered — stopping it was one recorded way to trap her.
- ✦ Attested as early as the 13th-century Ynglinga saga, where a mara tramples a king in his sleep.
Case File
- Classification
- Nightmare spirit
- Category
- Spectral/Undead
- Territory
- Rural Croatia
- First Sighted
- Slavic folk tradition
- Habitat
- Bedrooms of sleepers; keyholes and cracks
- Reported Size
- Shifting; often a smothering weight
- Also Known As
- Mara · Nightmare hag