Restless legs or restless sleep? What's the difference, and why does it matter?

If you struggle to settle your legs at night, wake frequently for no obvious reason, or a partner has told you that your legs twitch or kick while you sleep, you may have come across the terms restless legs syndrome (RLS) and periodic limb movements during sleep (PLMS).

They sound similar, and the two can occur together, but they aren't the same thing.

The simplest distinction is that restless legs syndrome is something you experience while you're awake; periodic limb movements happen while you're asleep.

Understanding which is happening matters, because they are diagnosed and treated differently.

What is restless legs syndrome (RLS)?

Restless legs syndrome (RLS) is a neurological sensorimotor condition characterised by an urge to move the legs, usually accompanied by uncomfortable sensations.

People describe these sensations in all sorts of ways: crawling, fizzing, tingling, aching, pulling, itching or simply an overwhelming feeling that they have to move their legs.

There are some important clues that distinguish RLS from things such as muscle cramps or peripheral neuropathy:

• symptoms begin or become worse when you're sitting or lying still;

• movement, such as walking or stretching, temporarily makes them better;

• symptoms tend to be worse in the evening or at night.

So RLS is primarily something you experience while you're awake, although its consequences can extend well into sleep.

Imagine being exhausted, climbing into bed and finally becoming still — only for that stillness itself to trigger an irresistible urge to move. For someone with significant RLS, falling asleep can become extremely frustrating. It isn't only bedtime that can be affected. Long flights, car journeys, sitting through a film or theatre performance, or simply relaxing on the sofa can become uncomfortable if remaining still triggers symptoms.

How common is restless legs syndrome?

Restless legs syndrome is surprisingly common, although estimates vary considerably depending on exactly how RLS is defined and how often symptoms need to occur.

A large systematic review and meta-analysis involving more than 480,000 adults estimated a corrected overall prevalence of around 3%, although other studies using different diagnostic criteria have produced higher estimates.

A reasonable estimate is that roughly 3–7% of adults may meet criteria for RLS, while fewer have symptoms frequent or severe enough to require treatment.

RLS can occur at any age. There can also be a strong genetic component, particularly when symptoms begin earlier in life.

Is restless legs syndrome more common in women?

Yes. RLS is consistently found to be more common in women.

In the large meta-analysis above, the prevalence was approximately 4.7% in women compared with 2.8% in men.

Pregnancy is a particularly important risk period. A 2026 systematic review and meta-analysis of nearly 57,000 pregnant women estimated that around one in five (21.9%) experienced RLS during pregnancy, although prevalence varied considerably between studies and populations. Pregnancy-related RLS often improves after delivery.

RLS has also been associated with iron deficiency and chronic kidney disease, and prevalence tends to increase with age in many populations.

What causes restless legs syndrome?

For many people, there isn't one simple identifiable cause.

RLS appears to involve changes in the brain systems controlling movement and sensation, with iron availability in the brain and dopamine signalling playing important roles.

There is also a genetic contribution, which helps to explain why RLS can run in families.

In other cases, RLS occurs alongside another condition or contributing factor. These can include:

• pregnancy;

• iron deficiency;

• chronic kidney disease;

• some medications;

• and other neurological or medical conditions.

This is one reason why persistent RLS symptoms are worth discussing with a healthcare professional rather than simply trying to suppress the symptoms yourself.

Can perimenopause or menopause make restless legs syndrome worse?

Restless legs syndrome can become more noticeable for some women during midlife, but the relationship with menopause isn't straightforward.

RLS is more common in women than men, and reproductive hormones may influence the brain systems involved in the condition. Some women report that their symptoms become worse after menopause, and research has found an association between RLS and vasomotor symptoms such as night sweats during the menopausal transition. However, studies haven't consistently shown that menopause itself — or falling oestrogen alone — directly causes RLS.

Other changes during midlife may also contribute. Low iron stores are particularly relevant for women experiencing heavy or prolonged periods during perimenopause. Some medications can exacerbate RLS, and other sleep disorders which become more common after menopause, including obstructive sleep apnoea, may coexist with restless legs or periodic limb movements.

There is also some evidence that periodic limb movements during sleep become more prominent in women with increasing age, although it isn't yet clear how much of this is due to menopause itself rather than ageing or other factors.

So if your sleep deteriorates during perimenopause or menopause, it's worth remembering that hormones aren't the only possible explanation. If you're experiencing an uncomfortable urge to move your legs at night, particularly when you lie down, RLS is worth considering as a potentially treatable cause of disrupted sleep.

What is the link between iron deficiency and restless legs syndrome?

Iron deserves particular attention because its relationship with RLS is more complicated than simply asking whether someone is anaemic.

Iron plays an important role in brain systems involved in RLS, including dopamine signalling, and evidence points towards low iron availability within the brain as an important part of the biology of the condition.

This means someone can potentially have iron levels that wouldn't ordinarily trigger concern about anaemia but that may still be relevant in the context of RLS.

Current American Academy of Sleep Medicine guidance places considerable emphasis on assessing iron status in people with clinically significant RLS.

For women who experience heavy menstrual bleeding — including some women during perimenopause — this is a particularly useful possibility to consider.

It's important not simply to start taking high-dose iron supplements, however. Iron supplementation should be guided by appropriate blood tests and medical advice, because too much iron can also be harmful.

How can restless legs syndrome affect sleep and daily life?

Mild RLS may be little more than an occasional irritation. Severe RLS can have a profound effect on someone's quality of life. Sleep is often where the greatest burden appears. Symptoms can delay falling asleep, repeatedly interrupt attempts to return to sleep and reduce total sleep time. The consequences can then spill into the following day, contributing to fatigue, difficulty concentrating, impaired mood and reduced productivity.

There can also be a psychological burden which is easy to overlook. If every attempt to become still is uncomfortable, bedtime itself can become something you dread.

And unlike many sleep problems, RLS doesn't necessarily leave you alone during the daytime. Travelling, working at a desk, attending a long meeting or sitting through a performance can all become difficult when symptoms are severe.

What can make restless legs syndrome worse?

Before reaching for medication, it's worth considering whether anything could be triggering or exacerbating the symptoms.

Current clinical guidance recommends considering factors including:

• low iron stores;

• caffeine and alcohol;

• some antihistamines, including those found in certain over-the-counter allergy and cold remedies;

• some antidepressant medications;

• medications that block dopamine, including some anti-nausea and psychiatric drugs;

• and untreated obstructive sleep apnoea.

Lack of sleep can also make symptoms more difficult to manage, potentially creating an unpleasant cycle: restless legs interfere with sleep, and exhaustion makes the symptoms even harder to tolerate.

Don't stop taking a prescribed medication because you suspect it is contributing to RLS. Discuss it with your doctor instead. There may be alternatives, or the benefits of the medication may outweigh its effect on your symptoms.

When should you see a doctor about restless legs syndrome?

An occasional restless evening isn't necessarily cause for concern.

But it's worth speaking to your GP if the urge to move your legs is:

• happening regularly;

• interfering with falling asleep or staying asleep;

• stopping you from sitting or relaxing comfortably;

• affecting your mood, concentration, energy or daytime functioning;

• or becoming progressively worse.

\It's also worth seeking advice if you develop symptoms during pregnancy, experience heavy menstrual bleeding or have another reason to suspect iron deficiency, have kidney disease, or think a medication may be contributing.

If you've previously been prescribed dopamine medication for RLS and notice that your symptoms are starting earlier in the day, becoming more intense, appearing more quickly when you sit down, or spreading beyond your legs, speak to the clinician managing your treatment. These can be signs of augmentation rather than simply progression of RLS.

How is restless legs syndrome treated?

Treatment depends on how frequent and disruptive your symptoms are and whether there is an underlying contributor. For occasional symptoms, relatively simple strategies may help. Walking, stretching or massaging the legs can provide temporary relief. Some people find heat or a warm bath helpful. Regular daytime physical activity and reducing caffeine or alcohol may also be worth trying. Persistent RLS shouldn't simply be dismissed as something you have to put up with.

Iron treatment for RLS

If you have significant RLS, your doctor may recommend blood tests to assess your iron status and look for other potential contributing factors. If iron levels are considered inadequate in the context of RLS, oral or intravenous iron may be recommended depending on your results and individual circumstances. The thresholds used when considering iron treatment for RLS can differ from those used simply to diagnose iron-deficiency anaemia, which is another reason to discuss your results with someone familiar with the condition.

Medication for RLS

Prescription medication can also be considered for more troublesome RLS. Interestingly, recommendations have changed in recent years. Drugs that increase dopamine activity, such as pramipexole and ropinirole, were once widely used as first-line treatments. We now know that long-term treatment can sometimes produce augmentation — a paradoxical worsening of RLS in which symptoms begin earlier in the day, become more intense or spread to other parts of the body.

The latest American Academy of Sleep Medicine treatment guidelines therefore recommend medications including gabapentin and pregabalin strongly for appropriate adults, while several dopamine agonists are now conditionally recommended against for standard long-term use because of the risk of augmentation.

That doesn't mean dopamine treatments should never be used. Treatment needs to be individualised according to someone's symptoms, other health conditions, medications, preferences and potential risks.

What are periodic limb movements during sleep (PLMS)?

Periodic limb movements during sleep (PLMS) are different from restless legs syndrome.

These are repetitive, stereotyped movements that happen while you are asleep, typically involving flexing of the toes, ankle, knee or hip. They occur in sequences, which is what makes them "periodic".

You may have absolutely no idea that you're doing them.

Sometimes a bed partner notices kicking or twitching. At other times the movements are discovered during a sleep study performed for an entirely different reason.

PLMS are common in people with RLS, but you can also have PLMS without ever experiencing restless legs while awake. Crucially, having periodic limb movements during sleep does not necessarily mean that you have a sleep disorder.

How common are periodic limb movements during sleep?

PLMS become increasingly common as we get older. In one large population study of 2,162 middle-aged and older adults, 28.6% had more than 15 periodic limb movements per hour of sleep. Interestingly, in this study they were slightly more common in men than women: 31.3% of men compared with 26% of women met this threshold. Increasing age was one of the strongest predictors. This is why finding PLMS on a sleep study isn't enough, on its own, to conclude that they are a problem.

Frequent movements can be associated with brief arousals and changes in sleep, but they don't necessarily translate into noticeable sleep problems or daytime symptoms.

What is the difference between PLMS and periodic limb movement disorder (PLMD)?

PLMS describes the movements themselves. Periodic limb movement disorder (PLMD) is a clinical disorder in which periodic limb movements are associated with significant sleep disturbance or daytime impairment, and those problems aren't better explained by another sleep, medical or neurological condition. PLMD is therefore much less common than PLMS.

This distinction matters because otherwise there is a danger of treating a number on a sleep study rather than treating the person. If you sleep well, feel well during the day and happen to discover that your legs move periodically during sleep, those movements may not require treatment at all.

Do periodic limb movements during sleep need treatment?

Not necessarily. If PLMS have simply appeared on a sleep study and aren't associated with disturbed sleep or daytime symptoms, they may not need treating at all.

If someone has significant sleep disruption alongside frequent movements, a sleep specialist will usually consider whether something else explains the findings — including RLS, obstructive sleep apnoea, medication effects or another sleep or neurological condition — before diagnosing periodic limb movement disorder.

Evidence for treating PLMD in isolation remains surprisingly limited. Current clinical guidelines don't support simply prescribing RLS medication whenever periodic movements appear on a sleep study.

Restless legs syndrome vs PLMS: how can you tell the difference?

A simple way to remember the distinction is:

RLS is something you feel. PLMS are something your legs do while you're asleep.

If you lie down and develop uncomfortable sensations and an irresistible urge to move your legs, particularly in the evening, that sounds more like restless legs syndrome.

If you have no uncomfortable sensations while awake but your partner notices repetitive kicking during sleep — or movements appear on a sleep study — those could be PLMS.

And it's possible to have both.

When should you seek help for periodic limb movements during sleep?

If a partner reports that your legs move frequently during sleep, that doesn't necessarily mean you need medical investigation.

It's worth seeking advice if the movements occur alongside:

• unexplained frequent awakenings;

• persistent insomnia;

• significant daytime fatigue or sleepiness;

• uncomfortable or restless sensations in your legs while you're awake;

• or symptoms of another sleep disorder, such as loud snoring, pauses in breathing or gasping during sleep.

Ultimately, the question isn't simply “Do my legs move?” but “Is something interfering with my sleep or my quality of life?”

RLS is a real and treatable neurological condition. PLMS, meanwhile, are surprisingly common — particularly as we get older — and don't always represent a disorder at all.

Understanding which one you're dealing with is the first step towards deciding whether anything actually needs to be done.

References and further reading

1. Broström A, Alimoradi Z, Lind J, Ulander M, Lundin F, Pakpour A. Worldwide estimation of restless legs syndrome: a systematic review and meta-analysis of prevalence in the general adult population. Journal of Sleep Research. 2023;32(3). Read the paper.

2. Haba-Rubio J, Marti-Soler H, Marques-Vidal P, et al. Prevalence and determinants of periodic limb movements in the general population. Annals of Neurology. 2016;79(3):464–474. Read the paper.

3. Altalbawy MAF, Kareem M, Sanghvi G, et al. Prevalence of restless legs syndrome during pregnancy: a systematic review and meta-analysis. Sleep Medicine. 2026;144:108904. Read the paper.

4. Winkelman JW, Berkowski JA, DelRosso LM, et al. Treatment of restless legs syndrome and periodic limb movement disorder: an American Academy of Sleep Medicine clinical practice guideline. Journal of Clinical Sleep Medicine. 2025. Read the AASM guidance.

5. NHS. Restless legs syndrome. Information on symptoms, possible causes, self-management and treatment. Read the NHS guidance.