A shadowy, hat‑wearing figure known as the “Hat Man” has become a social‑media talking point in recent months, but sleep researchers and neuroscientists say the phenomenon most often reflects a well‑documented sleep state and the cultural images people bring to it.
Witness accounts describe the Hat Man as a dark, featureless silhouette in a trench coat and wide‑brimmed hat, commonly seen standing in a room’s corner. The visions are frequently reported during the transitional state between wakefulness and sleep, when people can be conscious but unable to move.
Researchers say the experiences are most often linked to sleep paralysis, a brief condition that can occur when a person wakes before normal muscle control has returned. "When we sleep, our motor muscles are prevented from moving — a physiological state called atonia," said Jane Teresa Anderson, a dream analyst and neurobiologist in Tasmania. If awareness returns while atonia persists, people can enter a limbo state in which they are partly awake and partly dreaming, often accompanied by vivid hallucinations.
Those hallucinations commonly take the form of an ominous presence pressing on the chest, a shadowy figure watching from the corner, or other terrifying figures. "Although sleep paralysis only lasts a few seconds, the terrifying experience feels so real that you feel doomed," Anderson said.
Harvard neuroscientist Baland Jalal said the imagery people experience during these episodes is shaped by both brain physiology and culture. "Our brains use cultural imagery to give shape to these sensations," he said, adding that storytellers and filmmakers can both draw on — and feed back into — the pool of common sleep‑paralysis figures.
Experts point to the influence of modern horror as well as longer historical trends. Dr. Alice Vernon, a sleep‑disorder researcher at Aberystwyth University and author of the book Ghosted, said the content of sleep‑paralysis hallucinations has shifted over centuries. "People first saw witches, hags and incubi because that was a key part of folklore in the early modern period," she said. By the Victorian era, vampires, ghosts and skeletons predominated; more recently, horror‑movie monsters and imagined aliens have grown common.
Scholars have noted specific crossovers. Films such as A Nightmare on Elm Street, whose antagonist Freddy Krueger wears a signature hat and attacks people in their sleep, drew on accounts of shadowy sleep‑paralysis figures, Jalal and other researchers say. The cinematic figure, in turn, may reinforce expectations that later shape what dreamers see.
Clinical psychologist Brian Sharpless, who has researched sleep paralysis, said shadow people like the Hat Man are particularly common in contemporary reports. In a study of undergraduates, he said, shadow figures outnumbered classic demons and extraterrestrials. "It may represent a cultural shift," Sharpless said, suggesting younger people in some Western settings find shadowy, plausibly human silhouettes more believable than overtly supernatural beings.
Other scientists emphasise that such experiences are not simply cultural illusions but emerge from underlying brain states. Teresa Campillo‑Ferrer, a consciousness researcher at Pompeu Fabra University in Spain, said sleep‑paralysis episodes could be understood as a different kind of experience shaped by emotions and internal constructs rather than by external objects. "The ‘Hat Man’ may potentially represent a certain emotion or cultural construct that expresses itself through these visions," she said.
Medical factors can also play a role. Some accounts of Hat Man encounters have been linked to misuse of diphenhydramine, the active ingredient in many over‑the‑counter sleep and allergy medicines sold under names such as Benadryl, which at high doses can cause delirium and hallucinations.
Anecdotal reports underscore the variety of contexts in which people encounter the figure. A Texas woman interviewed as a child by the San Antonio Current described seeing a humanoid outline beyond her yard at night, moving in a strange sidling motion. Some witnesses describe sudden vanishing; others report the figure walking away as if ordinary.
Historical art also reflects long‑standing human reports of nocturnal visitations. Art historians and sleep researchers have pointed to Henry Fuseli’s 1781 painting The Nightmare as an early visual expression of the pressure and visitation sensations that modern clinicians associate with sleep paralysis.
Researchers say the persistence of such reports likely owes in part to an evolved tendency to assume the presence of another agent in ambiguous situations. "Humans are hardwired to err on the side of detecting a ‘someone’ rather than ‘no one’ — an adaptive survival advantage," Jalal said.
Clinicians who treat sleep disorders encourage people who experience frequent or distressing sleep‑paralysis episodes to seek medical advice. Therapies and sleep‑hygiene changes can reduce the frequency of episodes, and understanding the physiological and cultural sources of the visions can help people contextualise them as brain‑based phenomena rather than evidence of the supernatural.
Jane Teresa Anderson said dreams and related phenomena often mirror waking concerns. "Dreams reflect waking life but take us deeper, revealing the unconscious side of our daytime experiences," she said. "They tend to feature a problem or challenge that is not overcome."