Restless Legs Syndrome (RLS) and Sleep Apnea: What You Need to Know

Overview

Restless legs syndrome (RLS) and obstructive sleep apnea (OSA, often called sleep apnea) are two common sleep disorders that frequently occur together. Research shows that people with RLS are up to twice as likely to also have OSA, and people with OSA are more likely to experience RLS symptoms than the general population. When these conditions co-occur, they can disrupt sleep more severely, leading to extreme daytime fatigue, mood changes, and increased risk of long-term health problems like high blood pressure and heart disease. The good news is that both conditions are highly treatable, and addressing one often improves symptoms of the other.

Signs & Symptoms

RLS causes an uncontrollable urge to move your legs, usually accompanied by uncomfortable sensations like crawling, tingling, aching, or itching. These symptoms almost always occur in the evening or when you are resting, and they are temporarily relieved by moving your legs. OSA causes repeated pauses in breathing during sleep, often accompanied by loud snoring, gasping or choking sounds, and frequent nighttime awakenings. When RLS and OSA occur together, symptoms are often more severe and disruptive than with either condition alone.

• Difficulty falling or staying asleep, even when very tired
• Frequent nighttime awakenings, often from leg discomfort or breathing pauses
• Unrefreshing sleep even after 7 or more hours in bed
• Daytime sleepiness, irritability, or trouble concentrating
• Morning headaches, dry mouth, or sore throat from OSA
• Unusual leg sensations that worsen in the evening or when sitting/lying down

Causes & Risk Factors

The exact link between RLS and OSA is still being studied, but several overlapping factors are thought to contribute to their comorbidity. RLS is often linked to low iron levels in the brain, dopamine dysfunction, genetics, pregnancy, and certain medications (including some antidepressants and antihistamines). OSA is caused by a blocked or narrowed airway during sleep, with risk factors including excess weight, a naturally narrow airway, family history, smoking, alcohol use, and nasal congestion. Researchers believe that the low oxygen levels caused by OSA breathing pauses may trigger or worsen RLS symptoms, while RLS-related sleep disruption can make OSA breathing pauses more frequent. Shared risk factors like obesity, older age, and use of certain medications also increase the likelihood of developing both conditions.

Diagnosis

Diagnosing both RLS and OSA usually requires a combination of symptom reviews, medical history checks, and specialized testing. Your healthcare provider will first ask about your sleep patterns, leg symptoms, medical history, and any medications you take to look for patterns and potential triggers. A sleep study (polysomnogram) is the gold standard for diagnosing OSA: you will stay overnight at a sleep center, and sensors will monitor your breathing, oxygen levels, heart rate, and sleep stages to detect breathing pauses. There is no specific test for RLS, so diagnosis is based on your symptom history, usually using the International Restless Legs Syndrome Study Group criteria, which require that you have an urge to move your legs, symptoms that worsen at rest, are relieved by movement, and are worse in the evening or night.

Treatment & Management

Treating both conditions is key to improving sleep quality and overall health, and coordinated care between your providers is important. For OSA, first-line treatment is CPAP (continuous positive airway pressure) therapy, which uses a mask to deliver steady air pressure to keep your airway open during sleep. Other options include custom oral appliances, weight loss, positional therapy, or surgery for severe cases. For RLS, first-line management includes lifestyle changes like regular moderate exercise, avoiding caffeine and alcohol before bed, and leg stretches before sleep. If lifestyle changes are not enough, your doctor may prescribe medications such as dopamine agonists or iron supplements (if you have low iron levels). Many people find that treating their OSA significantly reduces RLS symptoms, as improved oxygen levels during sleep reduce a key trigger for leg discomfort.

Living With It

RLS and OSA are chronic conditions, but most people see significant improvement in symptoms and sleep quality with consistent, long-term management. It may take a few weeks to adjust to treatments like CPAP or new medications, so be patient with yourself and communicate openly with your care team about any challenges you face. Many people also find it helpful to connect with support groups for people with sleep disorders to share tips and experiences with others facing similar challenges.

• Track your sleep and leg symptoms daily in a diary to share with your doctor
• Use your CPAP machine every night, even when traveling, and talk to your provider if the mask is uncomfortable
• Do 10-15 minutes of gentle leg stretches or a short walk before bed to reduce RLS discomfort
• Avoid caffeine, nicotine, and alcohol within 3 hours of bedtime, as all can worsen both conditions
• Keep your bedroom cool (60-67°F / 15-19°C), dark, and quiet to reduce sleep disruptions