Restless Legs at Night: Why the Urge to Move Can Keep You Awake

You are tired enough to sleep. Then, as you settle into bed, your legs begin to feel strangely uncomfortable: crawling, pulling, fizzing, or simply impossible to keep still. Walking to the kitchen helps. Lying down brings it back. If this pattern sounds familiar, the problem may not be a lack of relaxation. It could be restless legs syndrome, a recognised neurological condition that can interfere with falling asleep and staying asleep.

Occasional fidgeting does not automatically mean restless legs syndrome. The distinctive feature is an urge to move that follows a particular pattern. Recognising that pattern matters because the advice often given for poor sleep — stay still, breathe slowly, try harder to unwind — may do little to address it.

1. The pattern matters more than the sensation

Restless legs syndrome, also called Willis–Ekbom disease, is diagnosed mainly from your description of symptoms. There is no single scan or blood test that confirms it. Clinicians look for an urge to move the legs, usually accompanied by unpleasant sensations, alongside several defining features.

• Symptoms begin or become worse during rest, such as sitting or lying down.
• Movement, including walking or stretching, partly or completely relieves symptoms while it continues.
• Symptoms occur mainly in the evening or at night, or are worse then than during the day.
• The pattern is not better explained by another problem, such as leg cramps, swelling or positional discomfort.

The sensation varies considerably. Some people describe an internal itch they cannot scratch; others feel a deep tugging or electrical restlessness. Symptoms can also appear during an evening film or a long flight. In more severe cases, they may extend into the daytime or affect the arms.

A cramp is usually a sudden, painful tightening of a muscle. Restless legs is more typically an uncomfortable need to move. Numbness, burning or pain that persists regardless of rest or time of day deserves assessment for other causes, even if it also disrupts sleep.

2. Why bedtime can bring symptoms to the surface

Restless legs combines two influences: inactivity and a daily rhythm that tends to intensify symptoms later in the day. Bedtime brings both together. That helps explain why someone can feel reasonably comfortable while moving around, then struggle as soon as the lights go out.

The underlying biology is still being studied. Evidence points to differences in brain iron regulation and in signalling systems involved in movement, including dopamine. This is not the same as saying that everyone with restless legs has a simple dopamine deficiency. The condition is more complex, and treatments that affect dopamine can sometimes make the long-term pattern worse.

"Being exhausted and needing to move are not opposites. With restless legs, they can arrive together."

Some people also have repeated, involuntary limb movements during sleep, known as periodic limb movements. These may fragment sleep, but they are not identical to restless legs syndrome. A partner noticing kicking does not establish the diagnosis. A sleep study is not usually needed for a straightforward restless legs assessment, although it may help when another sleep disorder is suspected.

3. Why iron deserves a proper assessment

Iron helps support normal brain function, including processes involved in dopamine signalling. Importantly, a normal haemoglobin result does not rule out iron-related issues relevant to restless legs. You can have no anaemia and still have iron results that warrant discussion in the context of your symptoms.

The American Academy of Sleep Medicine’s 2025 clinical practice guideline recommends regular iron studies for people with clinically significant restless legs syndrome. These include ferritin, which helps assess stored iron, and transferrin saturation, which helps assess iron availability. Results need clinical interpretation: ferritin can rise with inflammation, and treatment thresholds for restless legs differ from those used in general iron-deficiency care.

This is a reason to ask about testing, not to start iron tablets independently. Excess iron can be harmful, supplements can cause side effects, and the appropriate treatment depends on your results and medical history. Oral or intravenous iron may be considered in selected cases under medical supervision.

Restless legs can run in families and is more common during pregnancy and in people with certain conditions, including chronic kidney disease. If iron deficiency is found, understanding its cause matters too. A clinician may ask about heavy periods, diet, blood donation or possible blood loss rather than simply recommending a supplement.

4. Helpful habits — and treatments worth reviewing

Simple measures can make symptoms more manageable, although evidence for individual home remedies is limited. Gentle walking, stretching, massage or a comfortably warm bath may offer temporary relief. Regular, moderate activity is reasonable; if strenuous late exercise seems to worsen your symptoms, try moving it earlier.

Caffeine and alcohol can aggravate symptoms in some people. Reducing them is a practical experiment, especially later in the day. Keeping sleep reasonably regular also helps avoid adding sleep deprivation to an already difficult night. Magnesium is often promoted online, but evidence is insufficient to recommend it as a routine treatment for restless legs.

Medicines deserve a review. Some sedating antihistamines, antidepressants and medicines that block dopamine can worsen symptoms. Do not stop prescribed treatment yourself; ask your clinician or pharmacist about alternatives. Mention any over-the-counter sleep aids, which may contain an antihistamine.

Prescription treatment has evolved. The 2025 AASM guideline advises against standard use of several dopamine-based medicines because of augmentation: treatment-related worsening in which symptoms may start earlier, become more intense or spread. Other treatments, including gabapentin-related medicines, have stronger recommendations for appropriate adults, but require individual assessment. If you already take a dopamine-based medicine, do not stop it abruptly; arrange a review.

5. A practical plan for the next week

You do not need a perfect sleep diary or a drawer full of supplements to begin. The most useful next step is to make the pattern clearer and seek help if symptoms repeatedly interfere with sleep.

1. Record symptoms for one week: when they start, what they feel like, whether movement helps, and how they affect sleep.
2. Note caffeine, alcohol, medicines and supplements. Look for patterns without assuming that every difficult night has one obvious cause.
3. Try one gentle comfort measure, such as a short walk or stretch, rather than forcing yourself to remain still through discomfort.
4. Book a clinical review if symptoms recur or affect daytime functioning. Ask whether the pattern fits restless legs and whether iron studies are appropriate.

Medical safety note: new one-sided leg swelling, redness, warmth or significant pain is not a typical restless legs pattern and needs prompt medical assessment. During pregnancy, discuss symptoms and any treatment with your maternity clinician.

If worry about sleep has become a separate problem, CBT-I may help address accompanying insomnia, but it does not replace assessment or treatment of restless legs. Start tonight by noting the pattern, choosing one gentle relief measure, and making a plan for review rather than adding another sleep product.