Sleep Paralysis

Sleep Paralysis (commonly known in folk culture as "karabasan"), is a type of parasomnia characterized by temporary inability to move or speak while fully conscious during the transition from deep sleep to wakefulness, often accompanied by vivid and frightening hallucinations. This condition arises when the normal progression of the rapid eye movement (REM) sleep phase is disrupted, causing the muscle atony—paralysis—characteristic of REM sleep to persist into wakefulness. Isolated attacks in healthy individuals and sleep paralysis occurring as a symptom of an underlying neurological disorder such as narcolepsy represent distinct medical presentations.

^{Normal REM Sleep and Sleep Paralysis: Differences Between the Two Conditions (Generated by Artificial Intelligence)}

Sleep paralysis is a dysfunctional and neurochemically complex transitional phase in which REM sleep and wakefulness occur simultaneously. Under normal conditions, during REM sleep, a complete muscular paralysis occurs in the body to prevent physical enactment of dreams. In sleep paralysis, inhibitory neurotransmitters such as gamma-aminobutyric acid (GABA) and glycine, located in the pons and ventromedial medulla of the brainstem, become active. These neurotransmitters continue to suppress motor neurons in the spinal cord, blocking voluntary muscle movements. According to a neurochemical theory, overactivity of cholinergic "sleep-on" neurons and underactivity of serotonergic "sleep-off" neurons cause the brain to remain in a hybrid state between sleep and wakefulness.

^{Neurobiology of Sleep Paralysis: Brain Regions and Functions (Generated by Artificial Intelligence)}

During this process, the amygdala, thalamus, and brainstem enter into excessive activation interactions. This hyperactivity creates the neural basis for the individual's intense fear and perception of threatening elements in the environment. Distortions in bodily perception, such as sensations of flying or out-of-body experiences, are associated with dysfunction in the superior parietal lobule, a region responsible for sensorimotor integration and proprioception.

• Electroencephalogram (EEG) spectral analyses show intermediate characteristics between wakefulness and REM sleep in alpha, theta, and delta frequency bands during sleep paralysis.^【1】
• No statistically significant difference has been found in beta frequency bands between sleep paralysis and normal REM sleep.
• Based on data from 35 studies encompassing a total of 36,533 individuals, the prevalence of sleep paralysis in the general population is 7.6%.^【2】
• This rate increases to 28.3% among students and 31.9% among psychiatric patients.^【3】
• Recurrent isolated sleep paralysis (RISP) is observed in 15% to 45% of individuals who have previously experienced an episode.^【4】
• Among algorithms tested on datasets to identify the relationship between sleep quality and sleep paralysis, the "random forest" model predicted sleep paralysis with 91.9% accuracy.
• In the same study, the "Support vector machine (SVM)" model achieved 80.49% accuracy, the "polynomial" model 47.56%, and the "RBF" model 42.88%.^【5】
• Observed durations of immobility vary across populations: average 5.3 minutes in Cambodians, 5.2 minutes in Egyptians, and 4.2 minutes in Danes.^【6】

^{Epidemiological and Cultural Statistical Data on Sleep Paralysis (Generated by Artificial Intelligence)}

A genetic predisposition to sleep paralysis has been identified. Polymorphisms in genes involved in regulating circadian rhythms and cellular-level sleep cycles—PER1, PER2, PER3, CLOCK, ARNTL2 and DBP—increase susceptibility to sleep paralysis.^【7】Additionally, variants in the CACNA1C gene, which regulates calcium channels, and the ABCC9 gene, which affects sleep duration, contribute to abnormal sleep physiology. Recent neurogenetic studies have shown that activation of the SIRT1 (Sirtuin 1) gene, known as an anti-aging gene, regulates sleep cycles and stress responses.^【8】This gene activation modulates neuroinflammatory pathways against sleep fragmentation, offering a potential therapeutic mechanism.

Episodes of sleep paralysis typically last from a few seconds to several minutes. During this transient paralysis, eye movements and the diaphragm muscle responsible for breathing remain unaffected. This is vital, as it ensures uninterrupted respiration and vision, preserving essential life functions. More than 75% of experiences are accompanied by prominent hallucinations, categorized into three main types:

• Intruder Hallucinations: An intense feeling of dread and panic, often accompanied by the perception of a human or shadowy figure in the room, interpreted as a demonic or dangerous presence.
• Incubus Hallucinations: A sensation of intense pressure on the chest, often accompanied by a feeling of suffocation, making breathing difficult.
• Vestibular-Motor (V-M) Hallucinations: Sensations of false movement, flying, swimming independently of gravity, or out-of-body experiences including autoscopy (observing oneself from outside the body).

Various lifestyle and environmental risk factors can trigger sleep paralysis episodes. These include:

• Sleep deprivation and insufficient sleep
• Irregular sleep patterns due to shift work or jet lag
• Sleeping in the supine (back-up) position
• Intense psychological stress, emotional trauma, and anxiety
• Excessive caffeine, nicotine, or alcohol consumption before sleep

Although isolated sleep paralysis is not typically considered a disease in itself, it frequently overlaps with various clinical disorders.

• Between 20% and 50% of patients with narcolepsy experience sleep paralysis as an extension of the disorder's REM sleep abnormalities.^【9】.
• Post-traumatic stress disorder (PTSD), major anxiety disorders, panic disorder, and depression negatively affect REM regulation and increase episode frequency.
• Medical associations have also been identified between sleep paralysis and bipolar disorder and schizophrenia.
• From a physiological standpoint, obstructive sleep apnea, hypertension due to adrenergic dysfunction, Wilson's disease, and seizure disorders are other important underlying medical conditions.

^{Sleep Paralysis Worldwide: Culture-Specific Entities and Beliefs (Generated by Artificial Intelligence)}

Although sleep paralysis is a universal phenomenon, it is named differently across geographic regions under the framework of cultural priming and the "Salience Hypothesis of Supernatural Experiences." In Chinese culture, sleep paralysis is called "ghost pressure." In Egypt, 48% of cases are directly attributed to a "Jinn" attack, and patients often seek help from religious figures and Islamic healing methods (Ruqyah). In Italy, regional folklore attributes sleep paralysis to witch-like or cat-like entities known as Pandafeche, Ammuntadore, or Monaciello. In Newfoundland, Canada, the motif of the "Old Hag" sitting on the chest is used, while in Japan, the condition is described by the term Kanashibari, meaning "bound by chains." Among traumatized refugee groups in Cambodia, the phenomenon is called "the ghost pushing you down," while in South Africa it is known as Segatelelo, an attack attributed to a demonic dwarf-like creature called Tokoloshe. In the United States, it has been associated with alien abduction claims.

In Türkiye, the phenomenon of sleep paralysis has become intertwined with mythological narratives and religious beliefs. In a study conducted with university students in Istanbul, 88% of participants directly described sleep paralysis using the term "Karabasan".^【11】 This term combines "kara" (black or evil) with "basmak" (to press or crush), symbolizing a dark force that suppresses. In folk culture, Karabasan is typically depicted as a burnt-faced, foul-smelling, terrifying entity feared for its ability to touch people and transform them into similar monstrous beings.

^{Sleep Paralysis in Turkish Folklore: Karabasan, Weight, and Kamos (Generated by Artificial Intelligence)}

Other entities and concepts in Turkish folklore and literature that describe sleep paralysis have also been identified:

• Ağrılık (Weight): A malevolent entity believed to leap onto sleeping individuals with full weight, preventing them from waking and capable of suffocating them to death.
• Kamos: A force that sits on the chest of sleeping people, causing death or physical capture. Kamos is believed to sometimes take the form of a dwarf, giant, or black cat, and always wears a traditional leather hat called "börk." It is believed that if the victim successfully steals the börk, it will turn into solid gold.

Some individuals in the region interpret sleep paralysis as a spiritual punishment resulting from neglecting religious duties. Religious and traditional methods used to prevent sleep paralysis episodes include prayer (the most commonly used method at 61% rate^【12】), reciting the Quran, performing prayers, reciting the Asma al-Husna before sleep, consulting a religious teacher for a protective amulet (muska), and reciting the call to prayer. In similar Italian studies, people do not seek help from religious figures, whereas in Islamic cultures, the rate of consultation with religious healers and teachers is significantly higher.^【13】

In ethnically diverse and Islamic-rooted societies such as Pakistan, perception of sleep paralysis varies according to language and ethnic background:^【14】

• Pashtun Culture: The entity causing sleep paralysis is known as Khapasaan. Its female version, Sheeshaka, is depicted as a demon with long hair and backward-facing feet.
• Sindhi Culture: The backward-footed entity motif from Pashtun culture is referred to here as Pichal Pairi (crooked-footed woman).
• Pothwari Culture: The experience of sleep paralysis is attributed to a dark dwarf-like entity called Kaala Bona that sits on the chest and suffocates the person.
• Punjabi Culture: The dark entity causing this condition is identified as Andhrang or the jinn al-Jathum, believed to reside in bathrooms.
• Islamic Explanations: Patients associate their hallucinations with jinn, Churail (a long-haired female demon), or the Karin (Qareen), a spiritual companion assigned to every person in Islamic belief.

When examining the role of gender in sleep paralysis experiences, studies show that men commonly report seeing female demon forms (Churail), while women report feeling the presence of a masculine entity.^【15】 Women are more likely to seek help from Sufi figures, wear protective amulets, and recite prayers as defense mechanisms, while men tend to modify their sleep habits and seek support from their social environment.

Isolated sleep paralysis may not constitute a medical emergency on its own, but a comprehensive diagnostic process may be required to identify underlying sleep or psychiatric disorders. Diagnostic methods include the following steps:

• Clinical Evaluation and Patient History: Diagnosis begins with a detailed account of the patient’s reported experiences. Symptoms, sleep habits, medical history, mental health status, and substance use are assessed. Patients may be advised to maintain a sleep diary if necessary.
• Polysomnography (Nighttime Sleep Study): Used when underlying sleep disorders such as narcolepsy or sleep apnea are suspected. This test monitors muscle tone, breathing patterns, heart rate, and brain wave activity during sleep.
• Multiple Sleep Latency Test (MSLT): Conducted to assess daytime sleepiness, measure how quickly the patient falls asleep, and determine the speed of transition into REM sleep. This test plays a critical role in determining whether sleep paralysis is linked to narcolepsy.
• Exclusion of Comorbid Conditions: For accurate diagnosis, sleep paralysis symptoms must be differentiated from and ruled out as manifestations of other disorders such as nocturnal panic attacks, nightmares, exploding head syndrome, and post-traumatic stress disorder (PTSD).

Isolated sleep paralysis episodes typically do not require aggressive medical treatment. However, in chronic cases where quality of life is impaired or when occurring alongside narcolepsy, pharmacological and psychotherapeutic interventions are employed.

Selective serotonin reuptake inhibitors (SSRIs), tricyclic antidepressants, and stimulants are prescribed to suppress REM sleep, promote wakefulness, and treat narcolepsy. In the treatment of idiopathic hypersomnia, methylphenidate is preferred over modafinil as a final monotherapy. Additionally, anxiolytic agents such as clordiazepoxide and alprazolam support the establishment of a healthy postural atonia rhythm by reducing anxiety.

Cognitive Behavioral Therapy (CBT) teaches patients to challenge catastrophic thoughts during episodes and develop coping strategies for frightening hallucinations. Focusing on moving just one finger or toe during an attack (in vivo intervention) is a technique used to break the state of paralysis. Fundamental sleep hygiene practices—such as avoiding sleeping exclusively in the supine position, managing stress, and restricting caffeine and alcohol intake—form the foundation of preventive medical interventions.

Warning: The content presented here is intended solely for general encyclopedic informational purposes. The information provided should not be used for diagnosis, treatment, or medical advice. Before making any decisions regarding health, you must consult a physician or qualified healthcare professional. The author and KÜRE Encyclopedia assume no responsibility for any consequences arising from the use of this information for diagnostic or therapeutic purposes.