Restless Legs Syndrome: Why Do My Legs Need to Move at Night?

Legs that need to move at night are often restless legs syndrome (RLS), a neurological condition in which an uncomfortable urge to move the legs begins or worsens during rest, eases with movement, and is stronger in the evening. Iron deficiency, pregnancy, kidney disease, and certain medicines are linked to it, and sometimes no cause is found. RLS itself is not an emergency. This article covers how it feels, why nights are worse, what helps, and which leg symptoms need urgent care.

What restless legs feel like

People describe RLS in different ways. Some feel crawling, pulling, tingling, or itching deep inside the legs. Others feel an ache or a fizzy, electric sensation that is hard to put into words. Many say the sensation is less like pain and more like an irresistible need to move.

The feeling usually shows up when you sit or lie still, such as in bed, on a long flight, or in a movie theater. Walking, stretching, or shaking the legs often brings relief, at least for a while. Then the sensation may return when you settle down again. Some people also feel it in the arms, and in some cases the legs may twitch or jerk during sleep.

The features clinicians look for

There is no single blood test or scan that diagnoses RLS in most people. Clinicians rely on the story you tell. According to the National Institute of Neurological Disorders and Stroke, the diagnosis rests on a set of core features:

• An urge to move the legs, usually with uncomfortable sensations.
• Symptoms that start or get worse during rest or inactivity.
• Partial or complete relief from movement, such as walking or stretching, at least while the movement continues.
• Symptoms that are worse in the evening or at night, or that happen only then.
• Symptoms that are not explained by another medical or behavioral condition.

The last point matters. Several other problems can look like RLS, so a clinician usually asks about your medicines, other health conditions, and sleep habits before settling on the diagnosis.

Why nights are worse

The exact mechanism of RLS is not fully understood, and several factors probably contribute. Researchers have focused on two areas. One is dopamine, a brain chemical that helps control movement. The other is iron handling in the brain. The National Heart, Lung, and Blood Institute describes RLS as linked to problems with how the brain uses dopamine and iron.

Symptoms often follow a daily rhythm, and they are frequently stronger in the evening. Researchers think daily shifts in dopamine activity may help explain this, though it is not settled. Lying still in a quiet room also removes the distractions that keep the sensation in the background during the day. This is one reason RLS is closely tied to trouble falling asleep and staying asleep.

A family history is common. Some people with RLS have relatives with similar symptoms, and researchers have identified gene variants associated with the condition. Having those variants does not guarantee RLS.

Conditions and factors linked to RLS

In many people no clear cause is found. In others, RLS is associated with another condition or exposure. Tell your clinician if any of these apply to you:

• Low iron stores. Iron deficiency, with or without anemia, is associated with RLS. Blood loss, a diet low in iron, and absorption problems can all lower iron. See MedlinePlus on iron deficiency anemia for background.
• Pregnancy. RLS symptoms can appear or worsen during pregnancy, often later in pregnancy, and they commonly ease after delivery.
• Chronic kidney disease. RLS is more common in people with advanced kidney disease, including those on dialysis.
• Nerve conditions. Peripheral neuropathy, including neuropathy related to diabetes, can overlap with or mimic RLS.
• Certain medicines. Some sedating antihistamines, some antinausea drugs, and some antidepressants and antipsychotics are associated with worse symptoms in some people.
• Substances. Caffeine, alcohol, and nicotine may make symptoms worse in some people.
• Poor or short sleep. Sleep loss can make the sensation more noticeable, creating a cycle.

Never stop or change a prescribed medicine on your own because of restless legs. Ask the prescriber whether the medicine might be contributing and whether a different option is appropriate.

RLS compared with other nighttime leg problems

Not every uncomfortable leg at night is RLS. Painful, sudden muscle tightening is a different problem, covered in our article on night leg cramps, and the two can occur together. The table below shows how clinicians often tell them apart, though overlap is common.

If your legs feel heavy and tired rather than restless, that is a separate topic with its own causes.

How RLS is evaluated

A visit usually starts with questions. When did it start? Does movement help? Is it worse in the evening? Does anyone in your family have it? How is your sleep, and what do you take in a day, including over-the-counter products and supplements?

A clinician may examine your legs and nerves and may order blood tests. Iron studies, including ferritin, are commonly checked. The 2024 American Academy of Sleep Medicine guideline conditionally recommends iron replacement for adults with RLS and low ferritin; your clinician decides what counts as low for you. Tests for kidney function, blood count, and sometimes blood sugar and thyroid function may also be considered. Clinicians combine history, examination, and testing to reach a diagnosis. A sleep study is not required for most people but may be considered if another sleep disorder is suspected, such as sleep apnea or a condition with frequent limb movements during sleep.

Self-care that may help

For mild or occasional symptoms, lifestyle changes can help some people. Results vary, and what works for one person may not work for another.

• Keep a regular sleep schedule. A consistent bedtime and wake time may reduce symptoms for some people.
• Review caffeine, alcohol, and nicotine. Cutting back, especially in the afternoon and evening, may help. Notice whether symptoms change.
• Move your body earlier in the day. Moderate exercise is often recommended. Very intense exercise close to bedtime may bother some people.
• Try physical comfort measures. Stretching, a warm bath, massage, or a heating pad or cool pack on the legs can bring short-term relief for some people.
• Give your mind something to do. Puzzles, reading, or a hobby during long periods of sitting can reduce how much attention goes to the sensation.
• Track patterns. A short diary of symptoms, medicines, and meals can help your clinician spot contributing factors.

Because iron may be involved, you may wonder about taking an iron supplement. Iron can cause side effects and too much can be harmful, so ask a clinician to check your levels first and decide whether supplements are appropriate. For more on the broader problem of trouble falling asleep, see the related article below.

Treatment options to discuss with your clinician

If symptoms disturb your sleep or daily life, treatment may be appropriate. The best choice depends on how often symptoms occur, how severe they are, your other conditions, and whether you are pregnant or planning pregnancy.

• Treating a contributing factor. If iron stores are low, a clinician may recommend iron replacement, sometimes by mouth and sometimes by infusion. Adjusting a medicine that may be contributing is also an option, with the prescriber's guidance.
• Medicines that act on nerve signaling. Gabapentin enacarbil is approved in the United States for RLS, and gabapentin and pregabalin are sometimes used off-label. They can cause sleepiness and dizziness. Their product labeling also carries warnings about serious breathing problems when they are combined with opioids or other sedating medicines, or in people with lung disease or older age, and about mood changes or suicidal thoughts. Your clinician will review your other medicines and kidney function before choosing one.
• Dopamine agonists. Medicines such as pramipexole, ropinirole, and rotigotine have long been used. They can cause sudden sleepiness, including while driving, and impulse-control problems such as compulsive gambling or shopping, so tell your prescriber about any such changes. Because of the risk of augmentation (described below) and other side effects, the American Academy of Sleep Medicine 2024 clinical practice guideline advises against standard use of dopamine agonists and favors options such as iron replacement when iron is low and gabapentinoids. Your clinician can explain where each fits for you.
• Other options. In some cases a clinician may consider other medicine classes, or devices that stimulate the legs, depending on your situation.

Doses are individual and depend on the specific product and your health. Follow your prescriber's instructions and the label, and ask a pharmacist if you are unsure.

Augmentation: when treatment makes symptoms shift

Augmentation is a recognized problem, particularly with dopamine agonists. Symptoms may start earlier in the day, become stronger, spread to the arms or other body areas, or return more quickly after a dose. It can be mistaken for the illness getting worse, which can lead to the wrong response. If you notice this pattern, tell the prescriber. Do not raise, lower, or stop a medicine on your own, because the right adjustment depends on the specific drug and your history.

Sleep, mood, and daytime effects

Ongoing sleep loss can affect concentration, mood, and safety, including driving. Some people with RLS develop low mood or anxiety, and long-term poor sleep is associated with depression. If you are having thoughts of harming yourself, call or text 988, the Suicide and Crisis Lifeline, at any hour. If you have a plan or intent, or are in immediate danger, call 911.

RLS can also occur in children and teens, sometimes described as "growing pains" or attributed to attention problems. If a child often complains of an urge to move their legs at night, bring it up with their pediatrician.

When to get medical help

RLS itself is a chronic, manageable condition and not an emergency. The urgent concern is a different condition that can resemble it. Leg pain with swelling, warmth, or redness in one leg can point to a blood clot and needs same-day medical evaluation; call 911 if chest pain, trouble breathing, a racing heart, or coughing up blood is also present. Sudden weakness or numbness, especially on one side of the body or with trouble speaking, loss of balance, or loss of bladder or bowel control, needs 911 right away, because it can point to a stroke or a spinal problem. The lists in the emergency box below spell out which symptoms need 911 and which need care soon.

Schedule a visit if symptoms occur several times a week, interfere with sleep, or have become more intense. Bring your medicine list, including over-the-counter sleep aids and allergy medicines, and note any family history. Also mention if you are pregnant or have kidney disease, since that affects which options are appropriate.

When to Seek Medical Care