Restless Legs Syndrome and Sleep: What It Is and What May Help

It usually starts as an itch, or a crawling sensation, or a restless energy in the legs that you simply cannot ignore. It tends to arrive in the evening, worsens when you lie down, and the only thing that relieves it — temporarily — is moving. If this sounds familiar, it may be Restless Legs Syndrome.

RLS is more common than many people realise, and it is frequently underdiagnosed because people assume it is just something they have to put up with. It is not. Understanding what it is and what may help is a useful first step.

What Is Restless Legs Syndrome?

Restless Legs Syndrome (RLS) is a neurological condition characterised by an uncomfortable, irresistible urge to move the legs. The sensations are difficult to describe — people use words like crawling, tingling, aching, itching deep inside the leg, or a feeling of internal pressure. Moving the legs brings temporary relief, which is why it tends to interfere badly with falling asleep and staying asleep.

It can develop at any age but becomes more common from the 30s onward. Women are more likely to experience it than men. A 2009 study found that roughly 23% of people surveyed reported RLS symptoms — suggesting it is far more widespread than the level of public awareness might suggest.

What Causes It?

The exact mechanisms are still being studied, but several factors are consistently associated with RLS:

Iron deficiency — this is one of the most well-established connections. Iron plays a role in dopamine pathways, which affect movement regulation. Women are particularly susceptible due to monthly blood loss through menstruation, and blood loss during pregnancy and childbirth.
Magnesium deficiency — low magnesium is frequently mentioned in relation to RLS, and magnesium is involved in nerve function and muscle regulation.
Genetics — RLS tends to run in families, and researchers believe there is likely a significant genetic component.
Certain medications — some antidepressants, antihistamines, and anti-nausea drugs have been associated with triggering or worsening RLS symptoms. If symptoms began or intensified after starting a new medication, it is worth discussing with your prescriber.
Underlying conditions — rheumatoid arthritis, kidney disease, and peripheral neuropathy are among the conditions that have been associated with higher rates of RLS.

How RLS Affects Sleep

RLS is not just an inconvenience during the evening. When it prevents you from falling asleep or wakes you in the night, the cumulative effect on sleep quality can be significant. Chronic sleep disruption affects mood, concentration, energy, immune function, and a long list of other things that depend on adequate rest.

Many people with RLS also experience a related condition called Periodic Limb Movement Disorder (PLMD), where the legs jerk involuntarily during sleep — often without the person being aware of it, though it fragments their sleep cycles.

What May Help

This is an area where the right starting point is a conversation with your doctor, particularly because iron and other levels can be easily checked with a blood test. If an iron deficiency is identified, addressing it through diet or supplementation under medical guidance may be part of the picture.

Beyond that, there are practical things many people find helpful:

Magnesium — whether through food (dark leafy greens, nuts, seeds) or a supplement, adequate magnesium is worth paying attention to. Some people find magnesium glycinate or magnesium citrate easier on the stomach than other forms.
Reducing caffeine — coffee, tea, cola drinks, and caffeine-containing medications have been associated with worsening RLS symptoms in some people. Cutting back, particularly in the afternoon and evening, is a low-risk thing to try.
Warm baths before bed — a warm bath in the evening, followed by gentle leg massage, is something many people with RLS find soothing and report helps reduce the frequency of symptoms.
Regular gentle exercise — moderate movement during the day may help, though intense exercise close to bedtime can sometimes make symptoms worse.
Consistent sleep schedule — keeping regular sleep and wake times helps regulate the body clock and may reduce the severity of RLS in the evening.

When Magnesium and Sleep Tips Aren't Enough

Maybe you have already done the list. Magnesium every night. No coffee. A cool bedroom, a weighted blanket. And you are still turning over at 1am with legs that will not settle, then dragging yourself through the next day.

That is not a failure on your part. It usually means the home experiments have done what they can, and it is time for the checks only a doctor can run.

A word on magnesium first, since it is what most people reach for. None of the medical sources we checked recommends it for restless legs, and the American Academy of Sleep Medicine's 2024 guideline judged the magnesium studies too limited to grade.

That does not prove it does nothing. It means the evidence is too thin to lean on, so if it has not helped you, you have not missed a trick.

Ask about your iron, not just your blood count

Low iron is one of the best-known links with restless legs, and the National Institute of Neurological Disorders and Stroke names it among the things to treat first. The check is a blood test that includes ferritin, which measures your iron stores.

There is a catch. Cleveland Clinic notes that researchers have found low iron in the brain of people with restless legs "even if your blood iron levels are normal."

And the sleep medicine guideline says the iron targets for restless legs are "different than for the general population." So ask your doctor what your result means for restless legs specifically, not just whether it is in range.

Do not start iron tablets on your own. Mayo Clinic's advice is plain: "Only take iron supplements after having your blood-iron level checked and while being monitored by your healthcare professional."

Look at what is in the medicine cabinet

Some everyday medicines can make restless legs worse. The sources name some allergy and cold medicines (antihistamines), some antidepressants, some anti-nausea medicines and some antipsychotics.

The American Academy of Sleep Medicine adds one more that matters when you are this tired: over-the-counter sleep aids. The pill you buy for a bad night can be on the list of things making the nights bad.

Alcohol, nicotine and caffeine turn up across the sources too.

If you take any of these medicines, do not stop or change them yourself. Take the list to your doctor or pharmacist, who can review it and adjust it if needed.

That matters even more if you already take a prescription medicine for restless legs. Mayo Clinic notes that with some of them, symptoms can get worse over time, start earlier in the day or spread to the arms, and the sleep medicine guideline warns doctors against stopping them abruptly.

Talk to your doctor too if you are pregnant, have kidney disease, or take medicine for depression, anxiety, blood pressure, thyroid problems or diabetes, before adding any supplement.

Other conditions worth ruling out

Restless legs are linked to kidney disease, nerve damage (neuropathy), pregnancy, Parkinson's disease and sleep apnea. Cleveland Clinic says restless legs that begin after 45 are connected to an underlying condition, which is one more reason not to write it off as age.

Diabetes is a common question. The AASM says people with diabetes get restless legs at the same rate as everyone else, but diabetic nerve damage can feel similar and needs different handling. Another reason to have it looked at rather than guessed at.

Restless legs mostly affect the legs and can involve the arms. If you feel it somewhere else, in your hips for example, describe it to your doctor in your own words. The sources we read do not mention the hips, and sorting out what it is belongs with someone who can examine you.

What to bring to the appointment

The NHS puts the tipping point simply: see a doctor if it is stopping you sleeping, affecting your mental health, or "you've tried things you can do yourself but they have not helped."

Keep a sleep diary for about two weeks first. The AASM suggests the same. Alongside your sleep, note:

when in the day the feeling starts, where you feel it, and what it feels like in your own words
what eases it and what makes it worse
every medicine and supplement you take, including magnesium and anything over the counter
whether anyone in your family has restless legs
how tired you are the next day

You may not need an overnight sleep lab. Both the AASM and Mayo Clinic say a sleep study usually is not needed to diagnose restless legs.

When to See a Doctor

If you recognise these symptoms and they are affecting your sleep or quality of life, it is worth raising with your GP. RLS is a recognised condition and there are established approaches — both lifestyle-based and medical — that can make a meaningful difference. A blood test to check iron levels is often a useful first step.

You do not have to simply accept disrupted sleep as an unavoidable fact of life. Getting the right information is a reasonable place to start.

If you are looking at sleep from a broader natural health perspective, the free Health Bandit Sleep Report covers practical approaches to better rest that are worth exploring.

Also on this site: Nighttime leg cramps: why they happen | Does magnesium glycinate help you sleep | The 4 stages of sleep explained

External resource: Mayo Clinic: Restless Legs Syndrome — symptoms, causes, triggers, and treatment options for RLS