“A night-spirit that slips into the bedroom to crouch on a sleeper's chest, smothering them with terrible dreams.”
Before the nightmare was a metaphor, it was a visitor. In Danish and wider Scandinavian folk belief the mare is a night-spirit that enters the bedchamber unseen to crouch on the chest of a sleeper, pressing the breath out of them and filling their sleep with dread. The Danish language still carries the scar: mareridt, 'the mare's ride', remains the everyday word for nightmare, and behind that word stands centuries of farmhouse fear of what the dark could set on a sleeping body.
The mare is no modern invention. She rides through the Ynglinga saga of the thirteenth century, where a conjured mara tramples a king of Uppsala to death in his bed, and she survived in living belief into the modern era, blamed whenever a sleeper woke pinned and breathless or a horse stood sweat-soaked and exhausted at dawn. Folklorists now read her as the oldest recorded portrait of sleep paralysis in the North — terror given a body, a gender, and a name.
The Legend
Tradition holds that the mare comes by night in female form, though she is a shapeshifter: a beautiful young woman, a nasty old one, sometimes a man, a cat, a dog, or an owl. She settles her weight on the sleeper's ribcage and 'rides' them, bringing suffocation and terrible dreams. In some tellings she is a cursed or damned woman whose body is carried out mysteriously while she sleeps, visiting her neighbours' beds without ever knowing what she has done.
Her riding was not confined to people. Horses found trembling and lathered in the morning were said to have been mare-ridden through the night, their manes knotted into tangled 'marelocks'. Even trees bore her mark: gnarled, twisted pines were known in Swedish as martallar — mare-pines — stunted, the tradition said, by the weight of the creature passing over them on her way to the farms.
The Record
The mare's oldest surviving appearance is in the thirteenth-century Ynglinga saga, attributed to the Icelandic chronicler Snorri Sturluson. King Vanlandi Sveigðisson of Uppsala, having abandoned his wife Drífa, is killed by a mara conjured by the Finnish sorceress Huld: when his attendants guard his head, the creature treads his legs; when they seize his legs, she presses down upon his head until he is dead.
The written record then follows her through the word itself. From Old Norse mara and Old English mære — both from a Proto-Germanic root tied to crushing and pressing — comes the English 'nightmare', and Samuel Johnson's dictionary still defined the word by the crushing night-visit rather than the bad dream. The clinical picture matches what physicians now call sleep paralysis: waking immobility, chest pressure, and a vivid sense of a malevolent presence in the room.
The Lore
The mare belongs to a family of night-pressers found almost everywhere humans sleep: the Old Hag of Newfoundland, the Brazilian pisadeira, the Japanese kanashibari, 'bound in metal'. What distinguishes the Scandinavian tradition is its precision about who the mare is — often a living person, cursed rather than wicked, whose spirit rides out at night — and its practical anxiety about the harm she leaves behind in stable and bedchamber alike.
In Denmark she never quite left. Mareridt keeps her seated in the language, and her lore shades into the wider Scandinavian night-world of wandering spirits and sendings. For folklorists she remains a textbook case of belief built on real physiology: a substantial share of sleep-paralysis episodes arrive with hallucinations, and out of that recurring terror the North shaped a rider, gave her a name, and passed her down for seven centuries.
Field Notes
- ✦ Source of the English word 'nightmare' and the Danish mareridt, 'the mare's ride'.
- ✦ The traditional folk explanation for sleep paralysis: waking pinned, breathless, and not alone.
- ✦ Also rides horses, leaving them sweat-soaked by dawn with manes tangled into 'marelocks'.
- ✦ Kills a king in the 13th-century Ynglinga saga — Vanlandi of Uppsala, trampled by a conjured mara.
- ✦ Twisted pines were called martallar, 'mare-pines', in Swedish — stunted by her passing weight.
Case File
- Classification
- Nightmare spirit
- Category
- Spectral/Undead
- First Sighted
- Ynglinga saga, 13th century
- Habitat
- Bedchambers at night
- Reported Size
- Unseen weight; sometimes a woman or hag
- Also Known As
- Mara · Mareridt