Types of sleep paralysis and what are their characteristics

Types of sleep paralysis

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Sleep paralysis is a condition where, upon waking, your muscles stop working. There are different types of sleep paralysis, which we’ll explore in detail below.

different forms of sleep paralysis

The First Mentions of Sleep Paralysis

The earliest medical records of sleep paralysis come from Persian texts believed to have been written back in the 9th century. However, the information provided by these texts is quite vague. More detailed descriptions appeared later. In 1664, a Dutch physician published a collection called “The Disease Stories.” Of particular interest to researchers of sleep paralysis is the story called “Night-Mare,” which describes nightmares experienced by a 50-year-old woman. At the time, this condition wasn’t categorized into different forms of sleep paralysis, nor did it have a specific medical description. Up until the 19th century, it was thought that a person who experienced sleep paralysis had become possessed or that a demon had entered them, leading to muscle atrophy.

In some countries, ideas about possession became so ingrained in society that they became part of the language. For example, the word “nightmare” is derived from “Mare,” which is the name given to a demon believed to create bad dreams. Such demons have different names across cultures:

  • Ancient Europe – Mare
  • Italy – Pandafeche
  • Japan – Kanashibari
  • Russia – Domovoi
  • Arab countries – Jinn

Although the names are different, the descriptions of the symptoms of “demonic influences” are similar in every country.

How Common Is Sleep Paralysis?

Regardless of the existence of different kinds of sleep paralysis, it’s a widespread phenomenon. American scientists conducted studies showing that about 8% of people experience this condition at least once in their lives. Sleep paralysis occurs most frequently among students (28% of cases) and people with mental disorders (32%).

In 2020, a study yielded the following results:

  • 89% of participants had experienced a phasic state at least once in their lives
  • 37% often experienced such states
  • 71% had lucid dreams
  • 24% had experienced sleep paralysis

Sleep paralysis, lucid dreams, and other similar specific states are commonly referred to as the Phase. In the experiment mentioned above, several researchers went out into the street and asked passersby about sleep paralysis or other similar phenomena. They recorded people’s responses and noted characteristic features in each explanation. Considering that the statistics listed above align with those reported in other studies, the experiment’s results can be considered accurate.

Types of Sleep Paralysis

All types of sleep paralysis are unpleasant, but they also pass quickly. They occur when falling asleep and upon awakening. Despite the similarities of different types of sleep paralysis, they also have unique features.

Sleep Paralysis When Falling Asleep

This happens when consciousness transitions into REM sleep phase. If a person is in a normal state without stress or other issues, the brain disables the control option a few seconds before paralysis, making it almost impossible to remember the episode. This type is characterized by:

  • Motor disturbances (e.g., realizing you can’t move your arm)
  • Slow responses to brain signals (e.g., you want to move your hand but can do so only with great difficulty).
  • In some cases, auditory hallucinations or the illusion of loud sounds

These symptoms pass quickly, after which the person drifts into sleep. These episodes are hard to recall, which is one reason why many people think they’ve never had sleep paralysis.

Sleep Paralysis Upon Awakening

This is the most common kind. It’s accompanied by symptoms like:

  • Unusual fear (e.g., of death or a nonexistent monster)
  • A sensation of choking or a lack of air (90% of such cases occur because the person is sleeping on their stomach)
  • Hearing a strange voice nearby that isn’t actually there
  • Momentary disorientation in space
  • Uncontrolled and abrupt limb movements (parasomnia)

Such phenomena are frightening, motivating the person to try to wake up as quickly as possible. The process is often accompanied by groans or twitches that can be explained by psycho-emotional outbursts.

Conclusions

Based on surveys:

  • 100% of people are aware of sleep paralysis
  • 62.5% have not experienced the phenomenon
  • 31.3% have experienced symptoms resembling those that characterize sleep paralysis
  • 6.3% are unsure if they’ve ever experienced sleep paralysis

This information is very important and should be given more attention. People need to know what sleep paralysis is and receive scientifically verified information about it. For example, someone who finds it hard to distinguish the Phase from wakefulness could benefit from such information, as they might otherwise think everything is happening in reality, which could disrupt their psycho-emotional state.

Sleep paralysis doesn’t require treatment unless accompanied by a recurring and unfounded fear.

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FAQ

What is semi-sleep paralysis?
Semi-sleep paralysis refers to a state where a person begins to experience paralysis either as they are falling asleep or as they are waking up, but remains partially aware. It typically occurs during the transition into REM sleep phase. In this phase, the brain starts to shut off muscle control, which may result in a moment where the person feels stuck or unable to move, but is not fully asleep or awake. This type is often brief and hard to recall afterward.
Can sleep paralysis traumatize you?
While sleep paralysis itself is not physically harmful, it can be emotionally distressing—especially if it’s accompanied by terrifying sensations like choking, hallucinations, or fear of death. Repeated episodes, particularly those involving intense fear or strange voices, can leave a psychological mark and may even contribute to anxiety or sleep-related stress if not understood properly.
What does Islam say about sleep paralysis?
In many Islamic cultures, sleep paralysis is often linked to the presence of jinn, supernatural beings mentioned in religious texts. The sensation of being immobilized or feeling a dark presence is interpreted by some believers as a sign of spiritual interference. Although modern science explains it neurologically, cultural beliefs still influence how the experience is perceived.
What is the difference between a night terror and a sleep paralysis?
Night terrors and sleep paralysis are both sleep disturbances but occur at different stages of sleep. Night terrors happen in deep non-REM sleep and often involve physical movement like screaming or thrashing. In contrast, sleep paralysis occurs during REM sleep and involves complete muscle atonia, where the person is conscious but unable to move or speak, often accompanied by hallucinations.
What is isolated sleep paralysis?
Isolated sleep paralysis refers to episodes that occur without any other signs of a sleep disorder or neurological condition. It is a standalone experience not linked to narcolepsy or chronic insomnia. People with isolated sleep paralysis typically experience it infrequently and without long-term effects.
Should I ignore sleep paralysis?
Occasional sleep paralysis doesn’t typically require medical attention. However, if episodes happen frequently or lead to significant fear and confusion, it may be helpful to seek guidance. Understanding the phenomenon and reducing stress or improving sleep patterns can minimize future occurrences.
What is the difference between sleep paralysis and parasomnia?
Sleep paralysis is a type of parasomnia, but they differ in behavior. Sleep paralysis involves the inability to move despite being awake, often with vivid hallucinations. Other parasomnias—like sleepwalking or night terrors—involve performing physical actions while still asleep. Sleep paralysis is marked by stillness; parasomnias often involve unexpected movement.
How many sleep paralysis are there?
There are mainly two types: sleep paralysis when falling asleep (also called hypnagogic) and sleep paralysis upon awakening (hypnopompic). Though similar in nature, they differ by timing and symptoms. Falling asleep paralysis is usually short and subtle, while waking paralysis often involves vivid sensations and confusion.
What can sleep paralysis be mistaken for?
Due to its intense symptoms, sleep paralysis is sometimes confused with panic attacks, night terrors, or even supernatural experiences. People may also misinterpret it as a real-life threat because of hallucinations, such as hearing voices or feeling pressure on the chest.
What are disorders like sleep paralysis?
Disorders similar to sleep paralysis include lucid dreaming, false awakenings, and certain forms of parasomnia, like night terrors. These conditions all involve unusual experiences during the boundary between sleep and wakefulness. Some, like false awakenings, can feel very real and may be mistaken for waking life.
What is the difference between false awakening and sleep paralysis?
A false awakening is when a person believes they’ve woken up and begun their day, only to realize later they were still dreaming. In sleep paralysis, the person is genuinely awake but unable to move. Both can feel real and cause confusion, but only sleep paralysis includes full consciousness paired with physical immobility.

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