Spooky Nighttime Visitors: Paranormal or Parasomnia?

As Halloween approaches, Rebecca Fuoco, visits the haunted history of sleep paralysis and the supernatural.

Depiction of a creature from Romanian mythology believed to assault women in their sleep

Sleep paralysis is an inability to move or speak for a few seconds up to ten minutes when falling asleep (hypnagogic) or upon awakening (hypnopompic).  It is often accompanied by potentially terrifying visual, auditory, tactile, or other sensory hallucinations.  Sleep paralysis is common among individuals with narcolepsy but can occur in individuals without narcolepsy as a result of sleep deprivation, erratic sleep schedules, stress, physical fatigue, or certain medications.

Medically, sleep paralysis arises from a temporary discordance in the architecture of the rapid eye movement (REM) sleep phase (the phase in which most dreaming occurs).  This discordance happens when normal REM muscle atonia (suppressed muscle activity) sets in before sleep onset or persists into wakefulness, leaving the awake mind seemingly trapped in a paralyzed body.  But for the centuries preceding our medical understanding of the phenomena, these experiences were interpreted in a number of culturally-specific contexts, with explanations ranging from witchcraft and demonic spirits to space aliens.  In fact, the word nightmare derives from the Old English word maere, denoting a malevolent figure who lies upon and immobilizes or suffocates sleepers.

Here are five of the most common spooky visitors (and classic Halloween costumes) believed to cause sleep paralysis in history and folklore:

witch1. The Witch
Strikingly similar tales of witchy bedtime intruders have originated from all over the world, including the United States, Brazil, Newfoundland, Germany, and Scandinavian countries.  These legends generally involve a witch, “hag”, or otherwise damned woman who sits on a sleeper’s chest inducing terrifying dreams and causing successive inability to breathe or move for a short period of time. During the European and American witch trials of the 17th century, many alleged witches were accused of suffocating sleeping villagers and shape-shifting into a cat.

ghost2. The Ghost
For two thousand years in many Asian countries, sleep paralysis has been attributed to ghosts lying down on sleeping victims. In some legends the ghosts are recently deceased locals or relatives and in others the ghost is always the same, specific spirit.  For example, in Thailand it is believed that sleep paralysis is caused by a widow ghost known as Phi Am who sleeps on the chests of her victims. To defend against this ghost, some men would put on lipstick before going to bed, believing the ghost would not harm women.

demon3. The Demon
In Middle Eastern and African countries, the experience of sleep paralysis has often been attributed to demons crouching on the chests of sleepers in order to suffocate, hurt, or possess them.  Dating back to ancient Arabian mythology, many in this region have believed winged demons will pounce on the chests of sleepers who have not been praying.  Only twenty years ago, mass hysteria spread along the coast of East Africa about a bat-winged humanoid demon named Popobawa who assaults and crushes the chests of sleeping victims until they pass out.

vampire4. The Vampire
A frenzy of vampire accusations in Southeastern Europe spread panic across the continent in the 18th century.  These accounts usually involved undead individuals immobilizing and muting sleeping victims to drink their blood or otherwise, um, penetrate them.  Unlike the sparkling hunks of today’s vampire sagas, vampires were reported as bloated and ruddy.  Interestingly, the diaries of Bram Stoker, creator of the most iconic vampire character, reveal his idea for Dracula stemmed from a sleep paralysis hallucination of a woman trying to kiss him on the neck.

alien5. The Alien
The emergence of alien invasion movies in the 1950s spurred testimonies of aliens abducting sleeping victims in North America.  A frequent feature of these narratives is the feeling of being completely paralyzed and trying to scream for help but being unable to make a sound—standard sleep paralysis.  But many abductees also describe feeling or seeing themselves float up toward the sky.  Well, the feeling of floating and out-of-body experiences can be hallucinated during sleep paralysis, as can bright lights (“there was a beam of light…”).

Do you have your very own haunted tales of nighttime visitors?  Though they are unpleasant, we can take solace in the fact that these are an explained, parasomnia phenomenon and not a paranormal mystery.  In most cases, that is…


1. Davies O (2003).  The Nightmare Experience, Sleep Paralysis, and Witchcraft Accusations.  Folklore 114(2): 181-203.
2. Hufford DJ (2005). Sleep Paralysis as Spiritual Experience.  Transcultural Psychiatry 42(1): 11-45.
3. McNally RJ, Clancy SA (2005).  Sleep Paralysis, Sexual Abuse, and Space Alien Abduction.  Transcultural Psychiatry 42(1): 113-122.

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  • My dream visitor is always a burglar that has broken into my house and is standing over me, playing with my hair. It is terrifying, and I can’t move. And then I realize that he’s standing in front of a window (where there is no window) and my very protective labrador is asleep next to me. So I go back to sleep. But for about four minutes, I always think I am frozen in fear. But instead I then realize I’m dreaming.

  • Great post! These cultural stories tell about the universality of these experiences.

  • Great post! I’ve had a few creatures visit me, but the scariest is always the demon – once he was crawling up my bed towards my chest, and the second time he was sitting on the pillow next to me. The first time I freaked out, but now when I get it I just try to close my eyes until I can shake myself out of the paralysis.

  • Great post, Rebecca! Thank you for this eloquent and enticing post. I feel lucky that most of my recent hallucinations are simply a “version” of my boyfriend whose just loud walking around the apartment. Much better than my original hallucinations of attackers and burglars. http://julieflygare.com/shhhh-im-sleeping-narcolepsy-hallucinations/

  • I love me a great nightmare since I’ve learned to Lucid Dream! Not being insensitive to sleep paralysis or PTSD. But I’ve had some heart-pounding adrenaline surges in my dreams.

  • Michael J Hennessey
    October 24, 2014 8:02 pm

    When I was a child in the 50’s our bedroom was in the basement with a single panel door outside. It would blow open and snow would drift in, then aliens would come in on the snow. Of course the door never blew open.

    After Vietnam I was living on a lake and would see Sampans on the lake and here footsteps and voices on the deck.

    Today very tame. Now it is usually our dead dog sitting at the foot of the bed. I can feel the weight on my legs and the bed move as she jumps on the bed.

  • Nicole paulhus
    July 13, 2019 8:15 pm

    The first dream I had a scary experience I was, in bed sleeping I felt something grab my feet and pull me down end of bed I woke up afraid if felt very real! This last time I had a scary dream it started as, normal good dream I was going out to get something maybe a pizza, I got outside and noticed I had only one shoe on so I turned around and wad gonna go upstairs to get it all of a, sudden something grab me and flew me upstairs I said oh thank u then grabbed me again and flew Me roughly up to ceiling I couldn’t move to help myself and then I woke up I am still shaken!

  • Just woke up from floating around my house , it started with my arm Then the middle of my back and by the time icould remember i was on my ceiling going from room to room , there was a loud but quiet vibration feeling the whole time , i felt me praying so i can atleast control it but when i relaxed and let it happen i was able to jolt myself out of the dream which I (thought was real!!) and woke up with my head still on the pillow in the same position

  • I Just woke up from floating around my house , it started with my arm Then the middle of my back and by the time icould remember i was on my ceiling going from room to room trying to get my kids attention.there was a loud but quiet vibration feeling the whole time , i felt me praying so i can atleast control it but when i relaxed and let it happen i was able to jolt myself out of the dream which I (thought was real!!) and woke up with my head still on the pillow in the same position

  • I was trying to move my hands to touch something tangible,i saw my arm move in front of my face but when i woke up my hands were in the same position that i fell asleep in


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