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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Mythical Disclaimer: The images and data on this site are derived from various historical and literary sources, but we have found that many myths often have multiple versions and interpretations across references, sometimes contradictory. As a result, these creature depictions are artistic interpretations—imaginative blends of folklore, legend, and a dash of AI guesswork. Because creature descriptions vary widely, our illustrations and accompanying information represent our best effort to honor mythology while bridging creative gaps. Enjoy these interpretations—just remember, we've done our best to respect the stories and validate available data, but in the realm of mythology, details often shift, imagination leads the way, and nothing is ever set in stone!

Curated by the Mythological Creatures Team (rev. May 2025)