“A goblin of the dark that perches on a sleeper's chest, riding their nightmares and stealing their breath.”
The Alp is the reason German has a word for what sits on your chest at night. A nightmare demon of medieval and later folk belief, it slips into bedrooms through keyholes and knotholes, settles on the sleeper's breast, and grows heavier and heavier until its victim wakes paralysed, breathless and mute. The experience had a name — Alpdruck, 'Alp-pressure' — and it survives inside every modern German Alptraum, or nightmare.
Kin to the elves by name and nature, the Alp is a shape-shifter that may arrive as a cat, a pig, a snake or a white butterfly, but always wears its hat: the Tarnkappe, a cap of concealment that grants it invisibility and power, and stays visible whatever form the creature takes. Lose the hat and the Alp is desperate; seize it and you hold the demon's ransom. Few household terrors were ever so thoroughly equipped with rules.
The Legend
Folk tradition explained where Alps came from: the souls of unbaptized or stillborn children, infants born with a caul, the spirits of the recently dead, or familiars sent out by witches. By night the creature drank from sleepers — blood, or milk from nursing women — tangled hair into 'elf-knots', soured the milk in the dairy, and rode horses to sweat-soaked exhaustion in their stalls.
Its defining act was the visit. Through the smallest opening in the room — a keyhole was enough, or the hole where a knot had fallen from a board — the Alp came in and took its seat on the sleeper's chest. The victim felt the weight arrive, could not cry out, could not move; and in the morning, in villages across the German lands, that was not called a dream but a visitation.
The Record
The Alp is old on paper. Medieval German sources class it among the nature-demons, and the fourteenth-century Münchener Nachtsegen — a night-blessing — explicitly invokes protection against such pressing spirits, evidence that Alpdruck was being prayed against six centuries ago. The word's root ties it to the elves of Germanic mythology, and to figures like the dwarf Alberich, whose name means 'elf-powerful'.
The nineteenth century fixed the tradition in print. The Brothers Grimm recorded Alp legends; Karl Bartsch gathered beliefs about Alps and Maras; Kuhn and Schwartz in northern Germany, Temme in Pomerania and Baader in Baden collected tales of night-spirits trapped by stopping the hole they had entered through — narratives folklorists still mine as records of how sleep paralysis was once understood.
The Lore
The counter-measures were precise: shoes by the bed with the toes pointing at the door, a broomstick under the pillow, steel or scissors in the bedstraw, arms crossed before sleep, keyholes stopped, a light kept burning, a horseshoe at the bedpost, a mirror on the chest. Subtler wisdom advised trickery — invite the night-visitor to come back in the morning for coffee, and it must flee.
The Alp sits inside a wide web of pressing spirits — the Mahr and Mara of the north, the Trud of the south — that together gave German its vocabulary of the nightmare. Modern readers recognise the symptoms of sleep paralysis in every detail, which is precisely what makes the Alp valuable to folklorists: it is a clinical record written as a demon, the night terror given a hat, a shape and a set of rules.
Field Notes
- ✦ Gives its name to 'Alpdruck' (nightmare pressure) and lives on in the German word 'Alptraum'.
- ✦ Could be male or female and was sometimes thought to slip through keyholes.
- ✦ Protective charms included blocking keyholes and turning shoes by the bed.
- ✦ Its Tarnkappe, a cap of concealment, stays visible no matter what shape the Alp takes.
- ✦ The 14th-century night-blessing Münchener Nachtsegen already prayed for protection against it.
Case File
- Classification
- Nightmare demon
- Category
- Spectral/Undead
- First Sighted
- Medieval folk belief
- Habitat
- Bedchambers and sleepers' rooms
- Reported Size
- Small to human-sized
- Also Known As
- Alb · Mahr · Trud · Nachtmahr