I'm sure you've gone to bed in one position and woken up in a completely different one more than once. Turning over in bed, repositioning your pillow, or changing sides is usually part of normal sleep.So it's not always cause for alarm. However, when the movements are excessive, abrupt, or prevent rest, they may be a sign of something more serious.
In this article we'll take a closer look at why we move while we sleep. What is the difference between normal and pathological movements, what disorders might be behind certain nighttime behaviors, and when should you see a doctor?We will do it in clear language, without unnecessary technical terms, but without losing any detail of everything that is known today about this topic.
Is it normal to move while you sleep?
In the vast majority of people, Moving during sleep is a completely physiological part of rest.Our sleep is not a straight line, but is organized in cycles that repeat several times throughout the night.
These cycles usually last between 90 and 120 minutes and consist of different phases of non-REM sleep (from light to deep sleep) and REM sleep. In each transition between phases, especially when moving from lighter to deeper sleep or between cycles, it is common to make small postural changes.: turn around, bend your legs, reposition your arms, or move your head.
In fact, some studies indicate that a healthy person can do it naturally. between 30 and 40 movements per night, that is, up to about 5 movements per hourMany of them are almost imperceptible. The most typical are those of the legs, although we also move our arms and torso from time to time.
These adjustments make sense: They prevent us from maintaining the same posture for too long.This could cause tingling, muscle discomfort, or joint strain. By repositioning ourselves, we better distribute the pressure of our body weight and help prevent muscle tension, back pain, or a stiff neck upon waking.
The important thing is that, under normal conditions, These are gentle, non-violent, non-continuous movements that do not significantly disrupt sleep.The person sleeps soundly (with the normal awakenings of each cycle) and wakes up rested.
Sleep stages and why we move
To fully understand what happens when we move in bed, it's helpful to quickly review how sleep works. During the night we alternate between non-REM sleep and REM sleep, which are repeated in cycles of approximately one and a half to two hours.
Non-REM sleep consists of several stages, from very light sleep (when we are beginning to fall asleep) to deep sleep. It is precisely during non-REM sleep that most postural changes and bodily adjustments occur. those we were talking about before: turning around, repositioning the leg, turning around a little, etc.
In contrast, during REM sleep (the phase in which we dream most intensely and our eyes move rapidly under our eyelids), Our body enters a kind of physiological shutdown: the muscles lose tone and we can barely move.This temporary “paralysis” has a protective function: it prevents us from physically acting out everything we are dreaming.
Only a few small facial movements or occasional micro-gestures are spared from this muscle weakness. If we maintained normal muscle tone during REM sleep, we would get up, kick or punch, or even jump out of bed, mimicking the content of our dreams., with the risk of harming ourselves or whoever is sleeping next to us.
In addition to these movements linked to phase changes, there is a very typical phenomenon when we fall asleep or wake up: generalized brief spasms, called hypnagogic myoclonus (at the onset of sleep) or hypnopompic myoclonus (upon waking)It's that sudden jolt, like you're falling, where your whole body gives a little "jump." It's benign and common.
Common reasons why you move while sleeping
Beyond the normal structure of sleep, there are several everyday factors that explain why a person moves at night without necessarily having a disorder. The most frequent reasons are usually very simple and, in general, do not imply a serious problem..
One of them is the need to seek comfort. If an area of the body is under too much pressure, it starts to bother us or become numb.And the brain responds by sending a signal to change posture. That's why we reposition ourselves again and again until we find a more comfortable position, as help from... stretches before bed.
Another reason is the transitions between sleep phases. When transitioning from deep sleep to lighter sleep (or vice versa), it is very common for small micro-awakenings to occur. that we don't even remember the next day. In those few seconds we can move a little, stretch, or turn over before falling back into a deeper sleep.
External stimuli also play a role. Noises, temperature changes, light entering the room, or even the urge to go to the bathroom can cause us to move or change our posture.Sometimes a draft of cold air is enough to make us pull at the duvet or turn over in our sleep.
Therefore, If your nighttime movements are limited to these situations, are sporadic, and do not affect the quality of your rest or that of your partner, then they are not the only way to change your sleep.They are most likely within the normal range.
When does it stop being normal to move while you sleep?
The key point arrives: It's not so much whether you move or not, but how you move, with what intensity, and what impact it has on your daily life.We all change position; what is worrying is when very intense, repetitive, violent movements appear, or when they are accompanied by other symptoms.
A first warning sign is that nighttime movements cause Unrefreshing sleep: you wake up tired, with daytime sleepiness, bad mood, difficulty concentrating, or poor performanceAnother important indicator is that there are witnesses (usually your partner or family members) who describe unusual behavior while you sleep: continuous kicking, shouting, struggling gestures, intense talking, noises like bruxism, getting out of bed without being aware, etc.
In addition, it is advisable to pay attention to whether these movements They appear almost every night, last for a long time, follow a repetitive pattern, or are associated with injuries (falls, bumps against the wall or bedside table, bruises on oneself or one's partner).
When this happens, We are no longer talking about simple physiological postural changes, but about possible sleep disorders or other neurological or medical diseases that manifest themselves during the night.In these cases, it is advisable to consult a healthcare professional, ideally one specializing in sleep medicine.
In some situations, especially if the movements are very intense or difficult to classify, A sleep study (polysomnography) may be necessary.This is a test in which brain, muscle, respiratory, and heart activity is monitored overnight to see exactly what happens while you sleep.
Disorders related to excessive movement during sleep
When nighttime movements exceed what is considered normal, Various sleep disorders with their own characteristics may be behind it.Many of them share symptoms (kicking, shaking, talking, getting out of bed), so a good medical evaluation is important to differentiate them.
Periodic limb movement disorder
Periodic limb movement disorder (PLMD) is characterized by involuntary and repetitive leg movements during sleepTypically, there is a succession of flexion and extension of the knee or ankle that appears at regular intervals.
These movements can be repeated every few seconds or minutes and continue for extended periods of the night. Often the person is unaware of what is happening, but their partner notices frequent kicking or constant leg movement.The result is usually more fragmented sleep and daytime fatigue.
TMPE can appear in isolation or associated with other neurological pathologies. It is very common in people who suffer from restless legs syndromeHowever, it can also occur in individuals without known illnesses. A sleep study is usually essential for its diagnosis.
Restless Leg Syndrome
Restless legs syndrome (RLS) is another disorder closely linked to moving around too much at night. It is characterized by a very uncomfortable sensation in the legs when at rest, especially at nightfall or before going to sleep, which forces you to move them constantly..
Patients describe internal itching, tingling, “currents”, tightness, or a discomfort that is difficult to explain. It improves when you move your legs, walk, or massage them.In mild cases, they may simply uncover their leg, seek coolness, or constantly wiggle it, which makes it difficult to fall asleep.
In more serious situations, The person needs to get up several times, walk around the house, or even get out of bed for long periods of time.This significantly shortens sleep time. Furthermore, up to 80% of those with RLS also experience periodic limb movements during sleep.
Parasomnias: sleepwalking, night terrors, and other behaviors
Parasomnias are abnormal behaviors that occur during sleep. These can include everything from sleep talking and shouting to getting out of bed, walking, moving arms uncontrollably, or making complex gestures..
Non-REM sleep parasomnias, such as sleepwalking, are very common in children. night terrors or certain confusing awakenings. In these episodes the body seems to "wake up", but the brain remains in a slow, deep sleepso the child usually doesn't remember anything the next day.
A condition has also been described in childhood called restless sleep disorderIt is observed in children who, during the night, perform large body movements more than 5 times per hour, at least 3 nights per weekIf this results in daytime sleepiness, restlessness, or difficulty concentrating, it is considered pathological, although it is not yet officially included in the international classification of sleep disorders.
In adults, and especially in older people, other forms of parasomnia may appear, such as REM parasomnia or REM sleep behavior disorder, where the person physically acts out their dreams (we will see this in more detail later).
Sleep-related epilepsy
Some types of epilepsy have a clear relationship with sleep. Crises may occur primarily or exclusively during the night, and manifest themselves with very varied movements.
In certain types of nocturnal seizures, the body adopts a rigid and abnormal posture, with marked tension in the limbs and fixed deviation of the gaze and head to one sideThere may also be repetitive jerking of the arms and legs (clonic jerks), pedaling movements, or rhythmic swaying of the trunk or pelvis.
These crises often go unnoticed by the person affected, but Family members may notice noises, banging on the bed, or repetitive, abrupt movements.If there is any suspicion that it may be epilepsy, a specialized neurological evaluation is essential.
Sleep apnea and associated movements
Sleep apnea is a breathing disorder characterized by Repeated pauses in breathing or significant decreases in airflow while sleepingAlthough the main symptom is not the movements, these can appear as a response to each apnea.
After a pause in breathing, the body performs a small micro-awakening to recover normal breathing. At that moment, jerking, kicking, sudden changes in posture, and even loud noises may occur.The result is a very fragmented and unrefreshing sleep.
Alcohol consumption, sedatives such as some benzodiazepines, or excess weight can worsen sleep apnea. also increasing those sudden movements linked to the effort to breathe properly again.
REM sleep behavior disorder (acting out dreams)
REM sleep behavior disorder is a condition in which The person physically reenacts the vivid and often unpleasant dreams they have during the REM phaseInstead of becoming "paralyzed" as should happen at this stage of sleep, the muscles retain their tone.
During the episodes you can see kicks, punches, forcefully moving the arms, jumping out of bed, or making defensive or offensive gesturesThese episodes typically occur in response to dreams in which the patient feels they are being chased, attacked, or in danger. Screams, yells, loud laughter, or even insults are also common.
Unlike other parasomnias, it is common for the person will remember the dream if they wake up in the middle of the episodeFurthermore, these behaviors are not usually isolated, but rather begin gradually and tend to worsen over time if left untreated.
This disorder has been linked to various neurological diseases, especially Lewy body dementia, Parkinson's disease, and multiple system atrophyIt can also appear in association with narcolepsy, the use of certain antidepressants, or, in some cases, brain tumors.
Risk factors described include being male over 50 years of age (although more and more women and younger people are being diagnosed), Smoking, occupational exposure to pesticides, agricultural work, or having suffered head traumaA major complication is the risk of injury, both to the patient and their partner, from blows or falls during the episodes.
Other factors that increase nighttime movement
Not every time you move more than usual while sleeping does there indicate a clear motor disorder. There are factors that, while not sleep disorders themselves, fragment rest and secondarily increase postural changes..
The first of these is insomnia. When sleep is very light or is interrupted many times, more micro-awakenings occur.And with each of these movements, we tend to shift, reposition ourselves, or change position. In these cases, the main problem isn't so much the movements themselves, but rather the overall poor quality of sleep.
Stress and anxiety also play a significant role. A state of heightened mental arousal makes it difficult to fall and stay in deep sleep.and is associated with increased nighttime restlessness. If the cause is stress, the solution usually involves relaxation techniques, sleep hygiene, and sometimes psychological support.
Stimulant substances, such as caffeine, nicotine, or other drugs, They can significantly worsen sleep quality and increase the amount of nighttime movements., although these remain postural changes without a specific pathological pattern.
Conversely, alcohol and some sedatives such as benzodiazepines, although they appear to "relax", They can increase sleep apneas and, with them, the kicks or jerks that follow each breathing pause.Furthermore, they disrupt the normal architecture of sleep, making it less restorative.
Diet also plays a role: A diet high in ultra-processed and unhealthy foods deteriorates sleep quality and fragments it.This, in turn, favors more postural changes and nighttime awakenings.
When to see a doctor about moving while you sleep
Given all of the above, the big question is: At what point should we stop downplaying nighttime movements and seek medical evaluation? There is no perfect rule, but there are a number of useful guidelines.
It is advisable to consult a professional if the movements during sleep are intense, abrupt, frequent, violent, or follow a very repetitive patternAlso, if they have appeared relatively recently and have increased without a clear explanation.
Another compelling reason is that These movements are deteriorating your quality of life: they prevent you from falling asleep, wake you up many times, you notice non-restorative sleep, daytime sleepiness, irritability, or concentration problemsMany people with sleep movement disorders wake up exhausted, in a bad mood, and feeling like they've "fought" all night.
If there physical injuries (bumps, falls, bruises) or your partner feels threatened or uncomfortable by your nighttime behaviorIn such cases, a consultation becomes a priority. Similarly, if there is suspicion of epileptic seizures, complex behaviors such as sleepwalking or getting out of bed, or symptoms suggestive of sleep apnea (loud snoring, observed pauses in breathing, nighttime choking), it is advisable not to delay seeking medical attention.
The doctor will assess whether a sleep study is necessary and, depending on the diagnosis, They may propose anything from sleep hygiene measures and relaxation techniques to pharmacological treatments or the specific approach to underlying neurological or respiratory diseases.Specialized sleep centers have multidisciplinary teams (neurology, pulmonology, psychology) to study these cases in depth.
Moving while you sleep is usually part of the normal rest process and helps avoid awkward postures, but When movements are excessive, repetitive, violent, or accompanied by insomnia, daytime sleepiness, or strange behavior, they may be a sign of a sleep disorder or another illness.Listening to what happens at night (and what those who sleep with you say), taking care of sleep habits, and seeking professional help when something doesn't seem right is the best way to protect your rest and your long-term health.