Why Can’t I Move When I Wake Up? Sleep Paralysis Explained

What is sleep paralysis?

Sleep medicine defines it as a temporary inability to move voluntary muscles while falling asleep or waking up, with awareness of the surroundings largely preserved. A person may be able to breathe and move the eyes, yet feel that the body is locked, the voice will not come out, and the seconds last longer than they really do. An episode usually lasts seconds or minutes and then resolves on its own.

When these episodes occur without being part of narcolepsy, a medication effect, or another disorder, they are called “isolated sleep paralysis.” If they recur and cause distress or disrupt sleep, they may meet criteria for “recurrent isolated sleep paralysis.” Prevalence estimates vary because studies do not always use the same definitions or instruments; a recent review cites an estimate of 7.6% for having experienced at least one episode in the general population, while student and clinical samples show higher rates.

What happens during REM sleep?

Sleep moves through recurring stages, including rapid eye movement sleep. Dream activity is usually greater during REM, while the brainstem suppresses most skeletal-muscle movement. This atonia serves a protective role: the body does not act out every movement seen in a dream.

In sleep paralysis, the boundaries between these states do not shift in perfect synchrony. Conscious awareness of place begins, but motor inhibition remains for a short time. Researchers describe this as a dissociation between components of sleep and wakefulness: it is not fully awake in every respect, nor fully asleep in every respect. This overlap explains why apparently contradictory things can occur together:

• You see the real room or hear sounds from it.
• You know you are awake or close to waking.
• You cannot move your body or speak as you want.
• Dream-like sensory images enter the waking scene.

This is why sleep paralysis differs from an ordinary nightmare. In a nightmare, a person is inside a dream and then wakes from it. Here, awareness may wake into the room while part of the dream system and body remain in REM.

Why do you feel that someone or something is in the room?

A sensed presence is not a rare detail in descriptions of sleep paralysis. Medical sources mention feeling that someone is in the room or that something is pushing the body downward, while studies describe visual, auditory, and tactile hallucinations and a sense of nearby threat. The word “hallucination” here does not automatically mean a psychotic disorder; these experiences occur at a specific time during the transition between sleep and wakefulness, and reality testing is usually normal outside the episode.

The experience can be understood as three overlapping layers:

1. An inability the person cannot immediately explain

The first information reaching the brain is that the body is not responding. Sudden immobility in the dark is inherently threatening. The mind tries to build a rapid explanation: why can’t I move? Is someone holding me? Is there danger nearby?

2. Dream material continues

An image, sound, or tactile sensation from a dream can enter awareness of the room. Because the background is not an imaginary place but the person’s bed, door, and ceiling, the image merges with reality instead of being easily recognized as a dream.

3. The brain fills ambiguity with an agent

When fear, immobility, and an unclear sound or incomplete shadow occur together, perception tends to attribute the event to “someone.” This is a plausible explanatory formulation, not a single mechanism proven for every case. The more scientifically careful statement is that sensed presence probably emerges from an interaction between dream activity, threat-detection systems, representation of the body and space, and prior expectations.

Why do you feel pressure on your chest or suffocation?

Breathing continues during sleep paralysis, and not all respiratory muscles stop working. Even so, it is common to feel that breathing is inadequate or that there is a weight on the chest. Persistence of some REM breathing characteristics, sleep position, inability to change position, and panic that intensifies attention to breathing may all contribute. When a frightened person tries to take a large breath and cannot move the chest in the familiar way, the brain can translate the mismatch into pressure or suffocation.

For that reason, “something is sitting on your chest” should not be used as a causal explanation, nor should “it is just an illusion” be used to dismiss the pain. A more accurate statement is: chest pressure is a recognized symptom of this state and can be frightening, but it does not usually mean that breathing has stopped. Repeated waking with genuine choking, witnessed pauses in breathing, severe snoring, or daytime sleepiness may instead suggest sleep apnea and needs separate assessment.

Jathoom and the “Old Hag”: why do the stories resemble one another while the names differ?

In Arabic, “jathoom” is used for something that sits or presses down on a sleeper. In Newfoundland there is the story of the “Old Hag,” in Italy the “Pandafeche,” in Turkey “Karabasan,” and in other cultures ghosts, jinn, witches, or nocturnal attackers. The shared core is clear: immobility, a threatening presence, pressure, a shadow or sound, followed by sudden release.

But the relationship between the body and culture does not move in only one direction:

• The transitional sleep mechanism explains why common elements appear across different cultures.
• Culture gives the experience a name, face, and expected story: a jinn, old woman, witch, ghost, or alien visitor.
• Expectation and fear can increase attention to ambiguous signals and make the episode more memorable and perhaps more anxiety-provoking.

A study in Italy’s Abruzzo region found that participants used the local “Pandafeche” interpretation, and later work in the same sample found high fear and common hallucinations. A Turkish study likewise documented the name “Karabasan” and religious and folk methods of prevention. These are findings from specific samples and their percentages should not be generalized to the entire world, but they show that culture changes more than the label; it can also shape what a person notices and how the event is interpreted.

The reverse conclusion is also unwarranted: similar stories across cultures do not prove a single supernatural cause. Similarity is also expected if human bodies pass through a shared sleep mechanism and minds then express it in different cultural languages.

Is sleep paralysis a sign of mental illness or “going crazy”?

In most isolated cases, no. The important distinction is timing and context. Sleep-paralysis hallucinations occur while falling asleep or waking and resolve when full wakefulness returns. Hearing voices or seeing things in full wakefulness away from sleep, or persistent confusion about reality, needs a different assessment and should not automatically be attributed to sleep paralysis.

Sleep paralysis may be associated with disturbed sleep, anxiety, post-traumatic stress disorder, and some other conditions, but association does not establish that any one of them is the direct cause in every person. The relationship can also run in both directions: anxiety disrupts sleep, while a frightening episode increases anxiety and fear of sleeping.

What increases the likelihood of an episode?

Medical reviews and clinical guidance repeatedly mention factors including:

• Sleep deprivation or insufficient sleep.
• Irregular schedules, shift work, travel, and time-zone changes.
• Insomnia and fragmented sleep.
• Sleeping on the back in some people.
• Narcolepsy and some other sleep disorders.
• Anxiety and post-traumatic stress disorder in some samples.

These are risk factors, not deterministic rules. An episode can occur without an obvious trigger, and several factors may occur together. It is a mistake to notice one factor and then diagnose yourself with another disorder.

What should you do during an episode?

There is no magic movement that ends every episode, and experimental evidence for immediate interruption techniques remains limited. But education, reassurance, and reducing panic may lessen the experience. In practical terms:

1. Name what is happening: “This is sleep paralysis and it will pass.” The medical name is not a denial of fear; it can prevent the brain from constructing the worst possible explanation.
2. Do not repeatedly test your strength with violent effort: struggling with the whole body may increase panic. Focus on steady breathing as much as possible.
3. Try a small movement: a finger, eyelid, or toe. This may help some people recover movement, but it is not guaranteed.
4. Agree on a plan in advance with a partner or someone in the home: if they notice moaning or panicked breathing, they can call your name or use gentle touch. Responses vary, so agreeing before sleep is better.
5. After the episode, reorient perception: turn on a light, sit up briefly, look at the clock, and record the approximate time and duration instead of immediately reconstructing a frightening story.

How can you reduce recurrence?

Most people who have a passing episode do not need medication. Current sources recommend regular sleep and addressing the provoking factor:

• Regularly getting 7–9 hours of sleep for adults according to individual need.
• Keeping sleep and wake times reasonably consistent from day to day.
• Reducing sleep deprivation and abrupt schedule changes.
• Avoiding a heavy meal, alcohol, or caffeine close to bedtime if they affect your sleep.
• Trying to avoid sleeping on your back if you repeatedly notice a connection with that position.
• Addressing insomnia, anxiety, or an underlying sleep disorder with a professional.

Cognitive behavioral therapy may help when episodes recur and severe fear of sleep or catastrophic thoughts develop. Medication is not a self-treatment, and the recent review does not recommend routine medication for isolated cases; a sleep specialist decides whether it is needed when another disorder is present.

When should you see a doctor?

Consult a doctor or sleep clinic when:

• Episodes recur and make you afraid to sleep or cause you to avoid sleep.
• Lack of sleep causes persistent fatigue or disrupts school or work.
• There is severe daytime sleepiness, sudden sleep episodes, or loss of muscle tone with laughter or emotion; these signs require evaluation for narcolepsy.
• Others notice pauses in breathing, choking, or severe snoring during sleep.
• There are violent movements, injuries, loss of consciousness, or seizures, or the phenomena are not limited to transitions between sleep and wakefulness.
• Symptoms began after a new medication or substance, without stopping a prescribed medication on your own before consulting a clinician.

Seek urgent care if sudden weakness or paralysis occurs after fully waking, especially if it affects one side or is accompanied by facial droop or difficulty speaking, breathing, or swallowing; this is not the usual pattern of sleep paralysis.

Frequently asked questions

Can I open my eyes during sleep paralysis?

Yes. Some people open their eyes and see the room, while others feel unable to open them. Whether the eyes open does not rule the condition in or out.

Can I hear a clear voice or feel touch?

Yes. The experience can be auditory, visual, or tactile, and the senses can overlap. Their occurrence around the boundaries of sleep does not automatically indicate a psychotic disorder.

Can sleep paralysis cause death?

A medically recognized isolated episode is benign and resolves on its own. But that answer should not be used to ignore repeated choking, pauses in breathing, or neurological symptoms that do not occur only around sleep.

Can reading a frightening story or watching a video “create” an episode?

Frightening content does not create the REM mechanism from nothing, but it can increase anxiety and expectation; anxiety can disrupt sleep and shape the image through which a person interprets an ambiguous sensation. It is more accurate to say that such content may shape the experience and fear, rather than being its sole cause.

Is it wrong to call the condition “jathoom”?

The folk term itself is not the problem if it is used to describe the experience. The problem arises when the name carries a final causal judgment that prevents medical assessment or leads to harmful action. A cultural name can be retained while the medical mechanism is understood.

Conclusion: between denying the experience and believing its interpretation

Ethics comes before argument here. Do not tell a frightened person, “You imagined it,” as if the pain were unreal. And do not tell them, “This is possession,” as if an unseen cause had been known from a recognized sleep symptom. Begin with what can be checked: timing, duration of immobility, sleep pattern, daytime symptoms, witnesses, medications, and episode frequency. Compassion does not require settling the cause in the first minute.

This report is connected to Umm Abbas: Bringing Back the Beloved and the Divorced Woman

Ahmed Alhafiz’s forthcoming novel explores the ambiguous territory between fear, belief, medicine, and interpretation within a family. The question behind this report was inspired by one of its themes, after which the medical and cultural material was built from independent sources, without revealing the plot or presenting the novel as a medical source.

Novel page

How was this report prepared?

The literary description was separated from medical information. A recent clinical review, an open clinical guide, NHS guidance, and cultural studies from Italy and Turkey were reviewed. The novel was not used to prove a symptom or diagnosis, and a cultural interpretation was not presented as either proof or disproof of the unseen. Artificial intelligence was used to organize the research, check consistency, and build the page, not as a substitute for the references.

References

1. Stefani A, Tang Q. Recurrent Isolated Sleep Paralysis. Sleep Medicine Clinics. 2024;19(1):101–109. Recent review of mechanism, predisposing factors, and management.
2. Sharpless BA. A clinician’s guide to recurrent isolated sleep paralysis. Neuropsychiatric Disease and Treatment. 2016;12:1761–1767. Clinical guide to differential diagnosis, hallucinations, and interventions.
3. NHS, Sleep paralysis. Definition, associated factors, sleep advice, and when to seek primary care.
4. Jalal B, Romanelli A, Hinton DE. Sleep paralysis in Italy: Frequency, hallucinatory experiences, and other features. Used for cultural interpretation and fear in an Italian sample.
5. Jalal B, Eskici HS, Acarturk C, Hinton DE. Beliefs about sleep paralysis in Turkey: Karabasan attack. Used for the folk term and religious and cultural prevention methods in a Turkish sample.
6. NHS, Paralysis. Used to distinguish sleep paralysis from sudden weakness or paralysis that requires urgent care.