Restless legs syndrome and sleep: why your legs won't settle at night
Written and clinically reviewed by Sammy Margo, Chartered Physiotherapist and sleep specialist · Published: 11 September 2026 · Last reviewed: 11 September 2026
Restless legs syndrome is a neurological condition that creates an overwhelming urge to move your legs, usually with an uncomfortable crawling or aching sensation deep in the muscles, and it is a genuine cause of poor sleep rather than a habit to push through. It builds in the evening and settles, temporarily, once you move.
It happens because the brain's dopamine signalling and its handling of iron in certain movement-control circuits do not work quite as they should, which lowers the threshold at which your nervous system fires off an urge to move. Low brain iron stores are the best-understood trigger, even when a standard blood test looks normal. Symptoms follow a strong daily rhythm, worse in the evening and at night, which is why lying still to fall asleep is precisely the wrong thing for legs behaving this way.
If restless legs are keeping you up several nights a week, start with the basics: reduce evening caffeine and alcohol, keep a consistent sleep routine, and get moving rather than lying still. A ferritin blood test through your GP is worth requesting, since iron deficiency is a common and treatable driver. If symptoms are frequent or already affecting your daytime function, a physiotherapy assessment can help build a management plan around movement and sleep habits, alongside your GP's input on iron and, where needed, medication.
This guide covers why restless legs syndrome happens, a self-check for whether it fits the pattern, what the evidence actually says about exercise and other non-drug approaches, and when it is worth seeing your GP rather than managing it alone.
Why do my legs feel restless at night?
Restless legs syndrome happens because dopamine signalling and brain iron handling in the movement-control pathways of the brain do not regulate normally, which lowers the threshold for an urge-to-move signal.
Dopamine is one of the brain's main systems for smoothing out movement and suppressing unwanted urges to move. In restless legs syndrome, this system does not dampen background movement signals as effectively as it should, particularly in the evening when dopamine naturally dips as part of its normal daily rhythm. Brain iron is heavily involved too, because iron is needed to make dopamine, and low iron stores in the brain (even with a normal blood ferritin in some cases) further destabilise the system. This is a genuine neurological mechanism, not a sign of restlessness of character, and it explains why willpower alone rarely settles it.
The condition also has a strong genetic component, and certain medications, including some antidepressants, antipsychotics and cold and allergy remedies, can trigger or worsen it. Sitting still, whether on a long flight or in bed trying to fall asleep, is the single biggest trigger, because stillness removes the movement that normally keeps the urge suppressed.
Is this restless legs syndrome? A quick self-check
Restless legs syndrome is likely if you have an urge to move your legs with an uncomfortable sensation, it is worse in the evening or at night, it is worse when still, and it eases with movement.
Work through these four questions. All four being true is the pattern doctors use to diagnose restless legs syndrome clinically:
Question | If yes, this points towards restless legs syndrome |
|---|---|
Do you feel an urge to move your legs, usually with an uncomfortable crawling, aching, or itching sensation deep in the muscle rather than on the skin? | Core feature |
Does it start or worsen when you are resting or inactive, such as sitting or lying down? | Core feature |
Is it partly or fully relieved by movement, such as walking or stretching, at least for as long as you keep moving? | Core feature |
Is it worse in the evening or at night than during the day? | Core feature |
If all four apply, restless legs syndrome is likely and worth raising with your GP, particularly to check ferritin. If only one or two apply, or the sensation is sharp or on the skin surface rather than deep in the muscle, other causes are more likely, such as nerve irritation, cramps, or peripheral neuropathy, and a physiotherapy or GP assessment can help sort out which.
What the evidence actually says about non-drug treatment
The evidence for exercise as a stand-alone fix is weaker and more mixed than most wellness advice suggests, though movement, iron correction and sleep habits still form the sensible first-line approach before medication.
A 2018 randomised controlled trial in the Journal of the American Board of Family Medicine tested a structured lower-limb stretching and "trauma release" exercise programme against a discussion-group control in 18 adults with restless legs syndrome. Both groups improved by a similar amount, with no significant difference in symptom severity, sleep quality, or mood at six weeks, suggesting some of the benefit people report from exercise programmes may come from the structure and support of the intervention rather than the specific exercises. It is a genuinely honest finding: exercise is reasonable to try, but it is not a proven stand-alone cure, and small trial sizes like this one limit how confident anyone can be either way.
What has clearer support is addressing iron. A review of the efficacy and safety of iron supplementation for restless legs syndrome supports it, once deficiency is confirmed, as a sensible first step, alongside self-care measures such as a warm bath, leg massage, heat or cold packs, and consistent sleep hygiene. Iron deficiency, even at levels that would not concern a GP for anaemia, is one of the best-established and most treatable contributors, and correcting it often brings meaningful improvement, even where the trial evidence for exercise specifically remains thin.
When should I worry, and when should I see a doctor rather than book physiotherapy?
See your GP promptly, rather than waiting for a physiotherapy appointment, if restless legs symptoms are new and severe, occurring alongside numbness, weakness, or leg swelling, or if they started during pregnancy and are affecting your sleep significantly.
Most restless legs syndrome is not dangerous, but a few patterns need medical assessment:
Sudden, severe restless legs symptoms with no previous history, especially over 50, which can occasionally point to an underlying cause such as kidney disease or nerve compression that needs investigating.
Numbness, weakness, or loss of function in the leg alongside the restlessness, which is not typical of restless legs syndrome and needs a GP or 111 assessment to rule out a nerve or spinal cause.
Symptoms during pregnancy, which are common but should be discussed with your midwife or GP, since some standard restless legs medications are not suitable in pregnancy and iron levels need checking.
Leg swelling, redness, warmth, or pain in one leg only, which needs same-day medical assessment to rule out a blood clot rather than being put down to restless legs.
Restless legs symptoms alongside chest pain, breathlessness, or fainting, which needs urgent same-day GP or 111 assessment, and 999 if severe, since these are not restless-legs features and need a different work-up.
For the everyday pattern, physiotherapy has a genuine role in building a movement and sleep-hygiene plan around your daily routine, working alongside your GP rather than instead of one.
How we approach restless legs and sleep at SMARTPHYSIO
As SMARTPHYSIO's sleep specialist with over 30 years in practice, I see restless legs syndrome regularly, often in people told to "just relax" for years before anyone worked out what was going on. A typical assessment runs to a full hour: a detailed sleep and symptom history, including when symptoms started and whether there is a family history, then daytime activity, caffeine and alcohol timing, and medications that might be contributing.
From there we build a practical plan: a realistic evening movement routine that fits your life, sleep-timing adjustments, and a clear steer on when to push for a ferritin test or GP referral. Sleep is treated as a core specialism here, across our three London clinics and via home visits for anyone who finds evening travel difficult with unsettled legs. Those visits are carried out by our own trained physiotherapists, not an agency locum.
Common questions
What does restless legs syndrome actually feel like?
Most people describe a deep, hard-to-pin-down sensation in the calves or thighs, variously crawling, aching, itching, or like fizzing under the skin, rather than sharp pain. It is not usually on the skin surface. The defining feature is the urge to move the leg, and temporary relief when you do, which distinguishes it from cramp or nerve pain.
Can restless legs syndrome be cured?
There is no guaranteed cure, but symptoms can often be significantly reduced. Correcting low iron, adjusting or stopping contributing medications where possible, improving sleep habits, and medication where needed all help many people to a manageable level, even where the syndrome itself does not fully disappear.
Does exercise make restless legs syndrome worse?
Moderate daytime exercise generally helps rather than harms, but vigorous exercise very close to bedtime can occasionally aggravate symptoms in some people. The trial evidence for exercise as a specific treatment is mixed rather than strongly positive, so it is worth trying as part of a broader plan rather than relying on it alone.
Why are my restless legs worse when I am tired?
Sleep deprivation appears to further destabilise the same dopamine and iron-dependent pathways that drive restless legs syndrome, which is why a bad night often makes the following evening worse, creating a cycle that is worth breaking early with consistent sleep timing rather than catching up at the weekend.
Should I get a blood test for restless legs syndrome?
Yes, a ferritin test is a sensible first step, ideally through your GP, since low brain iron is one of the most common and directly treatable contributors, even when levels sit within a normal general reference range. Ask your GP what target ferritin they are aiming for, since restless-legs guidance often recommends a higher threshold than the standard "normal" cut-off.
Is restless legs syndrome the same as leg cramps?
No. Cramps are a sudden, sharp muscle contraction that is usually painful and brief, and are not relieved by moving the leg in the way restless legs syndrome is. Restless legs syndrome is an urge to move with a deeper, more diffuse discomfort that specifically improves with movement and follows an evening and night-time pattern.
About the author
Sammy Margo is SMARTPHYSIO's lead physiotherapist and a nationally recognised sleep expert with over 30 years' clinical experience, regularly featured in national media for her work on sleep and physical health. She leads on sleep-related physiotherapy across SMARTPHYSIO's three London clinics. Read more about Sammy's sleep expertise.
Book a clinic appointment
If restless legs are wearing down your sleep, a proper assessment can separate what is straightforward to fix from what needs your GP's input. Book a clinic appointment at Hampstead, Highgate or Soho, or enquire about a home visit if evening travel is difficult while your legs are unsettled.
