Restless legs syndrome (RLS) is a nervous system condition that creates a strong urge to move the legs, often with crawling, tingling, aching, or pulling feelings. It usually starts or worsens when a person is resting and is often more noticeable in the evening or at night. Movement may ease the discomfort briefly, but symptoms can return and make falling or staying asleep difficult.
What Does Restless Legs Syndrome Feel Like?
Restless legs syndrome, also called Willis-Ekbom disease, is a condition that affects movement and sensations in the legs. The urge to move can feel difficult to resist, particularly when sitting quietly, relaxing on a sofa, or lying in bed. The sensations often seem to come from deep within the legs rather than from the skin.
According to Mayo Clinic, the discomfort typically appears or becomes worse during rest, improves temporarily with movement, and is more noticeable in the evening or at night. Both legs are commonly affected, although symptoms can sometimes occur in one leg, the arms, or other parts of the body.
People may describe experiences such as:
- A crawling, creeping, or tickling sensation inside the legs.
- A pulling, tugging, or throbbing feeling.
- Aching, itching, burning, or tingling discomfort.
- A strong need to stretch, shake, or move the legs.
- Temporary relief while walking, stretching, or changing position, followed by the return of discomfort when resting again.
These experiences are examples of symptoms that may occur, not a checklist for identifying the condition. Leg cramps, nerve problems, and other conditions can cause similar discomfort. The timing of symptoms, the urge to move, and how movement affects the sensations help healthcare professionals distinguish between possible causes.
How Does Restless Legs Syndrome Affect Sleep?
RLS often affects sleep because the symptoms become more noticeable when the body is still. Just as a person is preparing to fall asleep, the urge to move may increase. Getting out of bed to walk, stretching repeatedly, or shifting position can interrupt the normal bedtime routine and delay sleep. When the discomfort returns after movement stops, the cycle may begin again.
Restless legs syndrome can affect sleep in several ways:
- Difficulty falling asleep: Uncomfortable sensations may make it hard to relax and settle into bed.
- Repeated interruptions: Symptoms that return during the night may lead to frequent changes in position or periods of wakefulness.
- Reduced sleep quality: Repeated movement and difficulty settling down may leave a person feeling that their sleep was not refreshing.
- Daytime tiredness: Poor or insufficient sleep can contribute to fatigue, sleepiness, irritability, and difficulty concentrating.
- Effects on daily life: Ongoing sleep disruption may affect work, study, relationships, mood, and the ability to manage everyday activities.
The Cleveland Clinic notes that disrupted sleep associated with RLS may contribute to daytime fatigue, mood changes, and problems with memory or concentration. These effects can make the condition difficult to manage, especially when symptoms occur regularly over time.
Can Restless Legs Syndrome Cause Leg Movements During Sleep?
Some people with RLS also experience periodic limb movements during sleep. These are repeated, involuntary movements, often involving the legs, that occur while a person is asleep. A bed partner may notice kicking or twitching even when the affected person is unaware of the movements.
Periodic limb movements during sleep are related to, but not the same as, restless legs syndrome. RLS involves an urge to move while awake and resting, usually accompanied by uncomfortable sensations. Periodic limb movements occur during sleep and can also occur in people who do not have RLS.
These movements may contribute to disrupted sleep in some people. However, not every movement during sleep indicates a sleep disorder, and a person can experience RLS without noticing repeated movements overnight. A healthcare professional can consider the reported symptoms and any observations from a bed partner when assessing sleep difficulties.
What Causes Restless Legs Syndrome?
The exact cause of restless legs syndrome is not fully understood. Research suggests that the way the body handles iron and the activity of dopamine, a chemical messenger involved in movement, may play a role. Some people have a family history of the condition, while others develop symptoms alongside another health condition or during a particular stage of life.
According to MedlinePlus, a service of the US National Library of Medicine, several health conditions, medicines, and lifestyle factors can be associated with RLS or may make symptoms worse.
- Low iron levels: Iron deficiency, with or without iron-deficiency anaemia, may contribute to symptoms.
- Pregnancy: Symptoms can develop or worsen during pregnancy and often improve after delivery.
- Kidney disease: Particularly advanced kidney disease, which may occur alongside changes in iron levels, is associated with RLS.
- Family history: Having close biological relatives with RLS may increase the likelihood of developing the condition.
- Age: RLS can begin at any age, including childhood, but becomes more common with increasing age.
- Medicines: Certain medicines, including some antihistamines and antidepressants, may worsen symptoms in some people.
- Substances and habits: Caffeine, nicotine, and alcohol may aggravate symptoms in some individuals.
Having one of these factors does not mean that a person will develop RLS. Likewise, many people who experience the condition do not have an obvious underlying cause. If symptoms begin after starting a medicine or changing its dose, a prescriber can review whether the medicine could be contributing. Prescribed treatment should not be stopped or changed without professional guidance.
How Is Restless Legs Syndrome Evaluated?
There is no single blood test that confirms restless legs syndrome. Healthcare professionals usually assess the symptoms and their pattern over time, along with the person's medical history and a physical examination. They may ask when the sensations begin, whether they occur mainly at rest, how movement affects them, and whether they interfere with falling asleep or staying asleep.
The Mayo Clinic's guidance on diagnosis and treatment explains that blood tests may be used to look for iron deficiency or other contributing health problems. Additional investigations may be considered when symptoms suggest another condition or when the cause of sleep disruption is unclear.
A sleep study is not routinely needed to assess every case of RLS. It may be useful when a healthcare professional suspects another sleep disorder or needs to investigate unusual movements during sleep. Because several conditions can cause leg discomfort or poor sleep, the assessment considers the whole symptom pattern rather than any single sensation.
What Can Help Reduce Symptoms at Night?
Everyday measures may make RLS symptoms easier to manage, although they do not work equally well for everyone. Maintaining a regular sleep routine and identifying personal triggers can be useful starting points. These steps are particularly relevant when symptoms interfere with relaxing at bedtime, but persistent sleep disruption may require additional assessment and treatment.
The NHS guidance on restless legs syndrome recommends several practical measures that may help relieve symptoms and support better sleep.
- Keep a regular sleep schedule: Aim to go to bed and wake up at similar times each day.
- Stay active during the day: Regular, moderate physical activity may help, provided it does not worsen symptoms.
- Try gentle movement: Walking, stretching, or massaging the legs may provide temporary relief when symptoms arise.
- Use a relaxing bedtime routine: A warm bath or a quiet activity before bed may help with relaxation.
- Review possible triggers: Reducing caffeine, especially later in the day, and limiting alcohol near bedtime may help some people.
- Keep track of symptoms: A simple record of bedtime, awakenings, symptoms, caffeine intake, and medicines may help identify patterns to discuss with a clinician.
When these measures are not enough, healthcare professionals may consider treatment based on the cause and the impact on sleep. If iron deficiency is identified, treating it may help. Other treatment options may include prescribed medicines for persistent symptoms. Iron supplements should only be used on professional advice after appropriate assessment, rather than started automatically for unexplained leg discomfort.
When Should You Seek Medical Advice?
Consider arranging a healthcare appointment when leg sensations or an urge to move repeatedly interfere with sleep, when tiredness affects daytime activities, or when symptoms persist or become more troublesome. An assessment is also appropriate when the sensations are difficult to explain, occur alongside other concerning symptoms, or begin after a medication change.
Professional evaluation can help clarify whether the symptoms fit RLS or may be related to another issue, such as leg cramps, nerve damage, or a different sleep disorder. If sleep problems are affecting mood, concentration, or the ability to function safely during the day, mention these effects during the appointment. The aim is to identify contributing factors and find an approach that addresses both the leg symptoms and the resulting sleep disruption.
Restless legs syndrome can be frustrating, particularly when symptoms repeatedly interfere with sleep, but options are available to help manage it. Understanding the link between rest, leg sensations, and nighttime symptoms can make it easier to describe the problem clearly and seek appropriate care.