Night hag: The night hag is a malevolent supernatural entity linked to the phenomenon of sleep paralysis.

Night hag - Explains historical accounts of sleep paralysis and underlies the origin of the term 'nightmare'.

Night hag

Night hag - Explains historical accounts of sleep paralysis and underlies the origin of the term 'nightmare'.

The night hag is a malevolent supernatural entity linked to the phenomenon of sleep paralysis. Often depicted as an old, terrifying woman, she immobilises her victims and induces night terrors. Her legacy is so profound that the modern term 'nightmare' finds its roots in her oppressive visits.

Origins & First Encounters

Source Texts & Tale Variants

Form & Powers

Regional Faces

Cultural Parallels

Legacy & Modern Evolution

Interesting Fact

The term 'nightmare' originally described the night hag’s oppressive visits, providing a direct linguistic link between folklore and the modern understanding of sleep-related phenomena.

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Quick Creature Info

Our Mythic Legendary Rating:

Ethereal Power
Ethereal Power rating

Also Sometimes Known As:

Old Hag

Habitat:

Intermediary space between sleep and wakefulnessNight/dream realmVariousAppears during episodes of sleep paralysisDomestic spaces, particularly bedroomsNear sleeping individuals

Supernatural Powers:

Induces sleep paralysisCauses nightmaresCurses victims

Physical Attributes:

Wrinkled skinAged appearanceMenacing gazeGauntWithered featuresSinister countenance

Abilities:

Manipulates the dream stateUses illusion magicInstills fearSupernatural resilienceUnnatural lifespan

Behavior:

MalevolentPredatory; haunts sleepers, causing terror during sleep

Weaknesses:

Vulnerability to holy artifacts

Lore:

Nightmare inducer and tormentorFolklore and myth; associated with sleep paralysisExplains historical accounts of sleep paralysis and underlies the origin of the term 'nightmare'

Related Creatures, Tales or Lore

References

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Curated by the Mythological Creatures Team

Series editor: Mythological Creatures Directory

Primary desk: Northern & European Folklore Desk

(rev. November 2025)