Quick Answer: Legs restless at night is usually caused by restless legs syndrome (RLS), a neurological condition linked to low iron levels in the brain and disrupted dopamine signalling. Symptoms include an irresistible urge to move your legs, often accompanied by crawling, pulling, or tingling sensations that worsen during rest and improve with movement.
In This Guide
Reading Time: 8 minutes
What Restless Legs Actually Feels Like
If you have never experienced it, restless legs syndrome is hard to describe. People use words like crawling, tingling, pulling, throbbing, aching, itching, or creeping. Some describe it as a feeling of electricity or carbonation under the skin.
The defining features, according to the American Academy of Sleep Medicine, are:
- An urge to move your legs that you cannot resist
- Symptoms that start or worsen during rest, especially when lying down
- Temporary relief from moving, stretching, or walking
- Symptoms that are worse in the evening and night
That last point is what makes RLS a sleep problem. The symptoms peak exactly when you are trying to fall asleep, turning bedtime into a frustrating cycle of leg movements, position changes, and wakefulness.
Why Your Legs Get Restless at Night
Iron and Dopamine: The Primary Connection
The strongest scientific evidence points to iron and dopamine. The brain uses iron to produce dopamine, a neurotransmitter that regulates movement. When iron levels in the brain drop below a certain threshold, dopamine signalling becomes erratic, producing the uncomfortable sensations and involuntary urge to move.
The National Institute of Neurological Disorders and Stroke (NINDS) identifies low brain iron as a central feature of RLS. Importantly, your blood iron levels can appear normal on a standard test while your brain iron remains low. Ferritin levels below 50 ng/mL are associated with increased RLS severity, even if they fall within the "normal" reference range.
Why Symptoms Worsen at Night
Dopamine levels naturally decline in the evening as part of your circadian rhythm. This is why RLS symptoms follow a predictable pattern: mild or absent during the day, and worst between 10 p.m. and 2 a.m. Research published in Sleep Medicine confirmed that RLS symptom severity tracks inversely with dopamine availability, peaking when dopamine reaches its daily low point. This also explains why stimulating activities during the day (walking, working) keep symptoms at bay, while passive rest in the evening triggers them.
Other Contributing Factors
| Factor | How It Contributes |
|---|---|
| Pregnancy | Iron demands increase; RLS affects up to 26% of pregnant women, especially in the third trimester |
| Kidney disease | Impairs iron metabolism and dopamine regulation |
| Peripheral neuropathy | Nerve damage in the legs mimics or worsens RLS sensations |
| Medications | Antihistamines, anti-nausea drugs, and some antidepressants can trigger or worsen RLS |
| Caffeine and alcohol | Both disrupt dopamine regulation and worsen symptoms in the evening |
| Vitamin D deficiency | Research links low vitamin D to increased RLS severity, particularly relevant in Canadian winters |
8 min read
Who Gets RLS?
RLS affects an estimated 5 to 15 percent of the general population, making it one of the most common sleep-related movement disorders. It is more prevalent in:
- Women (about twice as common as in men)
- Adults over 40 (symptoms typically worsen with age)
- People with a family history (about 50% of cases have a genetic component)
- Pregnant women (symptoms usually resolve after delivery)
RLS and Canadian Winters
The vitamin D connection is particularly relevant in Ontario. Between October and April, Canadians north of the 42nd parallel (which includes Brantford) do not receive enough UVB radiation to produce adequate vitamin D through sunlight alone. Health Canada recommends vitamin D supplementation for all Canadian adults during winter months. If your restless legs worsen seasonally, mention the vitamin D connection to your doctor.
7 Ways to Calm Restless Legs at Night
1. Move before bed. Moderate exercise earlier in the day, walking, cycling, or swimming, reduces RLS symptoms at night. Avoid intense exercise within 2 hours of bedtime, as this can temporarily worsen symptoms.
2. Stretch your legs. Gentle calf stretches, quad stretches, and hamstring stretches before bed can reduce the intensity of RLS episodes. Hold each stretch for 30 seconds and repeat 2 to 3 times.
3. Apply warm or cool compresses. Alternating warm and cool packs on your legs can distract the nervous system and reduce the uncomfortable sensations. Some people find a warm bath before bed equally effective.
4. Reduce caffeine and alcohol. Both substances affect dopamine regulation. Cutting caffeine after noon and limiting alcohol in the evening can noticeably reduce symptom severity within 1 to 2 weeks.
5. Check your iron levels. Ask your doctor for a ferritin test (not just a standard iron panel). If your ferritin is below 50 ng/mL, iron supplementation may help. Do not self-supplement with high-dose iron without medical guidance.
6. Massage your legs. Firm massage of the calves and thighs before bed can reduce symptoms for some people. The pressure and stimulation appear to temporarily reset the sensory signals that drive the urge to move.
7. Optimise your sleep surface. This is the factor within your immediate control that most people overlook.
Brad, Owner, 40+ years of experience: "We have had customers come in specifically because of restless legs. When we ask about their current mattress, it is usually something that has lost its support and creates pressure at the hips and knees. Switching to a mattress with individually wrapped coils, where each coil responds independently, can reduce the pressure that makes restless legs worse. It will not cure RLS, but it removes one aggravating factor."
Your Mattress and Restless Legs
Your mattress cannot cause restless legs syndrome, but it can make symptoms worse. Here is how:
Pressure restricts circulation. A mattress that does not contour to your body creates pressure points at the hips, knees, and ankles. Restricted blood flow to the legs intensifies the uncomfortable sensations that drive RLS symptoms. People with RLS need a surface that distributes body weight evenly.
Heat amplifies symptoms. Research shows that warm environments worsen RLS symptoms. A mattress that traps body heat, common with dense memory foam, raises local skin temperature at the legs, which can trigger or intensify episodes.
Motion transfer disrupts recovery. If you share a bed, a mattress with poor motion isolation means your partner feels every leg movement. This creates a cycle where your RLS disrupts their sleep, their reaction disrupts yours, and neither of you recovers properly.
Individually wrapped coil mattresses address all three issues. Each coil responds independently to pressure, reducing contact stress. The open coil structure allows airflow that manages temperature. And the independent coil response isolates motion so one person's movement does not transfer to the other side.
Our Restonic ComfortCare Queen at $1,619 has 1,222 individually wrapped coils. For customers who need the best possible temperature regulation alongside RLS management, the Restonic Luxury Silk and Wool model at $2,395 adds natural silk and wool fibres that passively regulate skin temperature through the night.
When to See a Doctor
Talk to your doctor about your restless legs if:
- Symptoms occur more than twice a week
- You regularly lose more than 30 minutes of sleep to leg movement
- Daytime fatigue is affecting your work, driving, or relationships
- Symptoms started or worsened after beginning a new medication
- You also experience numbness, tingling, or weakness in your legs during the day
In Ontario, your family doctor can order blood work (ferritin, vitamin D, kidney function) and refer you to a sleep medicine specialist or neurologist if needed.
Frequently Asked Questions
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Call 519-770-0001What deficiency causes restless legs at night?
Iron deficiency is the most well-established nutritional cause. The NINDS notes that low brain iron disrupts dopamine signalling, directly triggering RLS symptoms. Ferritin levels below 50 ng/mL are associated with increased severity. Ask your doctor about a blood test.
Does your mattress affect restless legs syndrome?
Your mattress does not cause RLS, but it can worsen symptoms. A mattress that creates pressure at the hips and knees restricts circulation to the legs, intensifying the uncomfortable sensations. An individually wrapped coil mattress provides responsive support that reduces pressure points and allows better blood flow.
Can restless legs at night be cured?
There is no cure for primary RLS, but symptoms can be effectively managed. If RLS is secondary to iron deficiency or another condition, treating the underlying cause can resolve symptoms entirely. Lifestyle changes, iron supplementation, and dopaminergic medications can reduce symptoms significantly.
When should I see a doctor about restless legs?
See a doctor if your restless legs occur more than twice a week, significantly disrupt your sleep, cause daytime fatigue, or if symptoms started after beginning a new medication. Your doctor may order blood work to check iron and ferritin levels.
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Related Reading
- Why Do I Have Bad Dreams Every Night?
- Why Am I Dreaming So Much Lately?
- Humidifier for Sleep: Cool Mist vs Warm Mist Explained
- Sleep Alliance Guide: When Couples Sleep Better Apart
- Best Mattress for Restless Leg Syndrome: What Actually Helps at Night
Sources
- National Institute of Neurological Disorders and Stroke. (2024). Restless legs syndrome. ninds.nih.gov
- Allen, R.P. et al. (2013). Evidence-based and consensus clinical practice guidelines for the iron treatment of restless legs syndrome. Sleep Medicine, 14(12), 1253-1267.
- Winkelman, J.W. et al. (2016). Practice guideline summary: Treatment of restless legs syndrome in adults. Neurology, 87(24), 2585-2593.
- Health Canada. (2024). Vitamin D and calcium: Updated dietary reference intakes. canada.ca
- American Academy of Sleep Medicine. (2024). Restless legs syndrome. aasm.org
This article is for educational purposes and does not constitute medical advice. If you experience persistent restless legs symptoms, please consult your healthcare provider.
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