Quick Answer: Restless legs syndrome (RLS) affects roughly 4 to 10% of adults and causes an urge to move the legs, especially at night. Iron deficiency is a common underlying cause, and 2024 AASM guidelines now recommend iron therapy as first-line treatment over dopamine medications. Talk to your doctor about ferritin testing.
In This Guide
- What Does Restless Legs Feel Like?
- What Is Your Body Lacking When You Have Restless Legs?
- Restless Legs Causes: A Complete Breakdown
- Why Do I Get Restless Legs at Night?
- How RLS Destroys Your Sleep Architecture
- How Do You Fall Asleep with Restless Legs?
- The Mattress and Adjustable Bed Connection
- When to See a Doctor
- FAQs
Reading Time: 15 minutes
You are exhausted. You have been up since 5:30 a.m., worked a full day, and finally crawled into bed at 10:30. Your body is ready. Your brain is ready. And then your legs start.
It is not pain, exactly. It is more like something crawling under your skin. An itch you cannot scratch because it is inside the muscle. The only thing that helps is moving, but every time you stop, it comes back. Your partner sighs. You get up, pace the hallway, come back to bed. It starts again.
If this describes your nights, you are likely dealing with restless legs syndrome and sleep disruption that goes far beyond a simple annoyance. This guide covers what RLS actually is, what causes it, what the latest research says about treatment, and what you can do tonight to get some relief.
What Does Restless Legs Feel Like?
One of the frustrating things about RLS is that it is hard to explain to someone who has never experienced it. When people ask what does restless legs feel like, they expect a simple answer. But the sensation varies widely from person to person.
Common descriptions include:
- Crawling or creeping sensations deep inside the calves or thighs
- A pulling or tugging feeling, as if something is drawing the legs downward
- Tingling or electric buzzing, similar to pins and needles but deeper
- An aching or throbbing that does not respond to stretching or massage
- A burning sensation, particularly in more severe cases
- An overwhelming, almost frantic urge to move that provides temporary relief
What does RLS feel like compared to a regular leg cramp? The two are different. A cramp is a sudden, sharp muscle contraction. RLS is a persistent, uncomfortable sensation accompanied by an uncontrollable urge to move. Cramps resolve when the muscle relaxes. RLS comes back the moment you stop moving.
What Are Restless Legs Symptoms? The Clinical Criteria
The International Restless Legs Syndrome Study Group defines RLS using five essential criteria:
- An urge to move the legs, usually accompanied by uncomfortable sensations
- Symptoms begin or worsen during rest or inactivity
- Symptoms are partially or totally relieved by movement
- Symptoms are worse in the evening or night
- Symptoms are not solely explained by another medical or behavioural condition
All five must be present for a clinical diagnosis.
8 min read
What Is Your Body Lacking When You Have Restless Legs?
This is one of the most searched questions about RLS, and the answer has changed significantly in recent years. If you are wondering what is your body lacking when you have restless legs, the primary answer is iron.
Even when blood tests show "normal" iron levels, the brain's iron stores can be depleted. Iron is essential for dopamine production, and dopamine is the neurotransmitter that regulates motor control and sensory processing. When brain iron drops, dopamine function suffers, and the result is the characteristic crawling, urge-to-move sensation of RLS.
2024 Guideline Shift: Iron Before Dopamine
This is a major update that most online guides have not caught up with. Updated clinical guidelines from 2024 now recommend iron supplementation as the first-line treatment for RLS, replacing dopamine agonist medications that were standard for decades. The shift happened because dopamine agonists, while initially effective, can cause a phenomenon called "augmentation," where symptoms gradually worsen and spread to other body parts with long-term use. The new recommendations:
- Check serum ferritin and transferrin saturation in all RLS patients
- Intravenous iron therapy if ferritin is below 100 ng/mL or transferrin saturation below 20%
- Oral iron supplementation for milder deficiencies
- Alpha-2-delta ligands (gabapentin, pregabalin) as second-line pharmacological treatment
- Dopamine agonists only as a last resort, at the lowest effective dose, for the shortest duration
Source: International RLS Study Group updated management algorithm, published in Sleep Medicine Reviews, 2024.
Beyond iron, other nutritional factors can play a role. Magnesium deficiency may worsen muscle irritability. Vitamin D deficiency, common in Canada's northern latitudes, has been associated with increased RLS severity in several studies. Folate (vitamin B9) deficiency during pregnancy is linked to the high rate of RLS in the third trimester.
Brad Grose, founder, Mattress Miracle, family owned in Brantford since 1997, with 40+ years in the mattress industry: "We are not doctors, and we always tell people with serious symptoms to see their family physician. But I cannot count the number of customers over the years who have come in saying their legs will not let them sleep. A lot of them had no idea it was an actual condition with a name and a treatment. Just knowing that helps."
Restless Legs Causes: A Complete Breakdown
Understanding what causes restless legs at night starts with recognizing that RLS has multiple potential triggers, and they often overlap.
| Category | Specific Cause | Mechanism | Prevalence |
|---|---|---|---|
| Nutritional | Iron deficiency | Impairs dopamine synthesis in the brain | Present in 40-60% of RLS patients |
| Genetic | Family history | Multiple gene variants identified (MEIS1, BTBD9, others) | Accounts for ~60% of early-onset cases |
| Medical | Kidney disease | Impaired iron metabolism, toxin buildup | 25-50% of dialysis patients have RLS |
| Medical | Pregnancy | Hormonal changes, increased iron demand, folate needs | Up to 26% of pregnant women, peaks in 3rd trimester |
| Medical | Peripheral neuropathy | Nerve damage in extremities | Common co-occurrence with diabetes |
| Medication | Antidepressants (SSRIs, SNRIs) | Alter serotonin/dopamine balance | Reported in up to 28% of SSRI users |
| Medication | Antihistamines (diphenhydramine) | Block dopamine receptors | Common OTC sleep aid trigger |
| Lifestyle | Caffeine, alcohol, nicotine | Disrupt dopamine regulation, fragment sleep | Dose-dependent worsening |
The restless legs cause that surprises most people is medication-induced RLS. Over-the-counter sleep aids containing diphenhydramine (the active ingredient in most "PM" formulations) can actually trigger or worsen restless legs. If you are taking these to sleep and your legs are getting worse, this may be why.
Why Do I Get Restless Legs at Night?
Almost everyone with RLS notices that symptoms worsen in the evening. Having restless legs at night is not a coincidence. It is built into the biology of the condition.
Three factors converge at bedtime:
Dopamine's daily rhythm. Dopamine levels follow a circadian pattern, peaking in the morning and declining through the afternoon and evening. Since RLS is linked to dopamine dysfunction, lower evening levels mean less symptom suppression. This is why restless legs night problems are so common while morning symptoms are rare.
Inactivity amplifies sensations. RLS symptoms are triggered by stillness and relieved by movement. Lying in bed is the worst possible combination: you are still, horizontal, and trying to relax. The condition essentially punishes you for doing exactly what you need to do to sleep.
Circadian gating. Research in the Journal of Sleep Research suggests that the body's internal clock independently amplifies RLS sensory signals during the sleep window, separate from the dopamine decline. This means even if dopamine levels were stable, the circadian system would still make restless legs at night causes worse during evening hours.
Canadian Climate and RLS
There is an interesting Canadian angle to restless legs. Vitamin D deficiency is widespread in Canada, particularly during the winter months when UV exposure drops dramatically. A 2019 study in Sleep Medicine found a significant association between low vitamin D levels and increased RLS severity. For Brantford residents going through a typical Ontario winter with limited daylight from November through March, this is worth discussing with your doctor. Health Canada recommends 600 IU of vitamin D daily for adults, though many Canadian physicians suggest higher supplementation during winter months.
How RLS Destroys Your Sleep Architecture
The relationship between restless legs syndrome and sleep loss goes deeper than just "it keeps you awake." RLS systematically dismantles your sleep architecture.
People with moderate to severe RLS lose an average of 1 to 3 hours of sleep per night, according to the National Institute of Neurological Disorders and Stroke (NINDS). But it is not just quantity. The quality of whatever sleep they do get is also compromised.
Many people with RLS also have periodic limb movement disorder (PLMD), where the legs jerk involuntarily during sleep in cycles of 20 to 40 seconds. Each jerk causes a micro-arousal that pulls you out of deep sleep or REM sleep. You may not fully wake up, but your brain shifts to a lighter sleep stage. Over a full night, this can mean dozens or hundreds of micro-arousals that prevent restorative sleep.
The cumulative effect of restless legs during sleep is similar to chronic insomnia: daytime fatigue, difficulty concentrating, mood changes, and impaired memory. Some studies have also linked untreated RLS to increased cardiovascular risk, though the research on this is still evolving.
How Do You Fall Asleep with Restless Legs?
If you are searching how do you fall asleep with restless legs, you are looking for practical strategies that work tonight. Here is what the evidence supports:
Immediate Relief Strategies
Before bed:
- Take a warm bath or shower. The heat relaxes muscles and can temporarily reduce the crawling sensation.
- Do 10 to 15 minutes of gentle calf and thigh stretches. Yoga poses like "legs up the wall" are particularly helpful.
- Massage your legs with firm, deep pressure. Focus on the calves and the front of the thighs.
In bed:
- Apply a heating pad or warm compress to your legs. Some people find alternating warm and cool more effective.
- Elevate your legs slightly. If you have an adjustable bed base, a 10 to 15 degree leg elevation can help.
- Use a weighted blanket. The deep pressure stimulation can reduce the urge to move for some people.
- Try pneumatic compression devices (leg sleeves that gently squeeze and release). A 2019 study found they reduced RLS symptoms by 35%.
During the day:
- Moderate exercise (walking, swimming, cycling) earlier in the day can reduce evening symptoms
- Cut caffeine after noon and limit alcohol to reduce nighttime severity
- If you take antihistamines for allergies, ask your doctor about switching to a non-sedating option
Dorothy Balicki, showroom and delivery coordinator, Mattress Miracle: "What I hear from customers with restless legs is that they dread going to bed. That is one of the saddest things in our line of work. We cannot prescribe medication, but we can help with the physical environment. An adjustable base that elevates the legs is one of the most underused tools for RLS, and it helps with other things too, like acid reflux and circulation."
The Mattress and Adjustable Bed Connection
A mattress cannot cure RLS. We want to be clear about that. But the right sleep surface can address two things that make RLS nights worse: physical discomfort that compounds symptoms, and partner disruption from involuntary leg movements.
Motion Isolation for Partners
If you share a bed, your RLS affects two people. The leg movements, the getting up to pace, the tossing, all of it disturbs your partner. Individually wrapped coil systems absorb motion rather than transferring it across the mattress. The Restonic ComfortCare Queen ($1,619, 1,222 individually wrapped coils) is specifically designed so that movement on one side does not radiate to the other.
Adjustable Bases for Leg Elevation
Elevating the legs slightly can relieve RLS sensations for many people. A flat mattress does not allow this without piling up pillows, which shift during the night. An adjustable bed base lets you find the exact angle that provides relief and maintains it throughout the night. Many of our customers with RLS use a slight leg elevation combined with a gentle incline at the head.
Pressure Relief
A mattress that creates pressure points at the hips and shoulders forces your body to shift position more often. For someone with RLS, this additional physical discomfort layers on top of the neurological symptoms, making everything worse. The Restonic Revive Tiffany Rose ($2,995, Talalay Copper Latex with 1,188 coils) combines latex pressure relief with copper-infused temperature regulation, which addresses both comfort and overheating.
Talia Grose, sleep specialist, Mattress Miracle: "I always ask couples where one partner has restless legs to both lie on the mattress during the test. One partner moves their legs while the other checks how much they feel it on their side. With individually wrapped coils, the difference compared to their old mattress is usually obvious within seconds."
When to See a Doctor
RLS exists on a spectrum. Mild, occasional symptoms may respond well to lifestyle changes and sleep environment improvements. But you should see your doctor if:
- Symptoms occur three or more nights per week
- Your sleep loss is affecting daily functioning, mood, or relationships
- Over-the-counter pain relievers and home remedies are not providing relief
- Symptoms are spreading to your arms or other parts of your body
- You are pregnant and experiencing RLS for the first time (iron and folate levels should be checked)
- Your current RLS medication seems to be making symptoms worse (possible augmentation)
Ask your doctor specifically about having your ferritin levels tested, not just standard iron panels. Current guidelines recommend treating RLS when ferritin is below 100 ng/mL, even if your hemoglobin looks normal. This is a common oversight in primary care.
In Ontario, your family physician can manage most RLS cases. For complex or treatment-resistant cases, a referral to a neurologist or sleep medicine specialist may be needed. The Brant Community Healthcare System can assist with local referral pathways.
This guide is educational and is not a substitute for medical advice. If RLS is significantly affecting your quality of life, please consult a healthcare provider.
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Medical Disclaimer: This information is educational and does not replace medical advice. Please consult your doctor, physiotherapist, or qualified healthcare professional for guidance specific to your situation.
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Call 519-770-0001Frequently Asked Questions
What is your body lacking when you have restless legs?
The most common deficiency linked to restless legs syndrome is iron. Even if your overall blood iron levels appear normal, the iron stores in your brain may be low. Updated 2024 clinical guidelines now recommend checking ferritin levels and transferrin saturation in all RLS patients, with iron supplementation as the first-line treatment when ferritin is below 100 ng/mL or transferrin saturation is below 20%. Dopamine pathway dysfunction is also involved, which is why the condition worsens in the evening when dopamine levels naturally dip.
What does restless legs feel like?
People describe the sensation differently, which is part of why RLS can be hard to diagnose. Common descriptions include crawling, tingling, pulling, aching, throbbing, burning, or an electric buzzing deep inside the legs. The key feature is an overwhelming urge to move that temporarily relieves the sensation. It is not the same as a leg cramp or muscle spasm, though the two are sometimes confused.
How do you fall asleep with restless legs?
Several strategies can help: gentle leg stretches or a brief walk before bed, a warm bath to relax the muscles, massaging your calves and thighs, applying a heating pad or cool compress (some people prefer one over the other), elevating your legs slightly with an adjustable bed base, and avoiding caffeine, alcohol, and heavy meals in the evening. Consistent sleep and wake times also help regulate dopamine, which can reduce symptom severity.
Can a mattress help with restless legs syndrome?
A mattress alone cannot treat RLS, but the right sleep surface can reduce triggers and make symptoms more manageable. Mattresses with individually wrapped coils provide motion isolation, which matters because RLS movement can disturb a sleeping partner. An adjustable bed base that elevates the legs can relieve some of the uncomfortable sensations. Pressure-relieving surfaces also reduce the physical discomfort that can compound RLS symptoms.
Why do restless legs get worse at night?
RLS symptoms intensify in the evening due to a combination of factors. Dopamine levels naturally decline as the day progresses, and since dopamine dysfunction is central to RLS, lower levels mean less symptom suppression. Being still and lying down removes the movement that temporarily relieves symptoms. Circadian rhythm also plays a role, as the body's internal clock seems to amplify RLS sensations during the sleep window.
Sources
- International Restless Legs Syndrome Study Group. (2024). "Updated Management Algorithm for RLS." Sleep Medicine Reviews.
- Allen, R.P. et al. (2003). "Restless legs syndrome: diagnostic criteria, special considerations, and epidemiology." Sleep Medicine, 4(2), 101-119.
- Earley, C.J. and Connor, J.R. (2017). "Iron and restless legs syndrome: treatment, genetics and pathophysiology." Sleep Medicine, 31, 61-70. PMC5334282.
- National Institute of Neurological Disorders and Stroke (NINDS). "Restless Legs Syndrome Fact Sheet." ninds.nih.gov.
- Wali, S. et al. (2019). "The association of vitamin D deficiency with restless legs syndrome." Sleep Medicine, 55, 87-93.
- Lettieri, C.J. and Eliasson, A.H. (2009). "Pneumatic compression devices are an effective therapy for restless legs syndrome." Chest, 135(1), 74-80.
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If restless legs are disrupting your nights, come in and test our adjustable bed bases and motion-isolating mattresses. We have been helping Brantford families sleep better since 1997, and we can show you how the right setup makes a real difference for RLS.