Sleep & Circadian Disorders
Sleep-Related Movement Disorders
Sleep-related movement disorders are a group of conditions that involve unwanted movements or uncomfortable sensations during sleep or while trying to fall asleep. These can include an urge to move the legs, repeated limb movements, painful muscle cramps, or teeth grinding.
Some symptoms make it difficult to fall asleep, while others interrupt sleep without the person realizing it. Over time, disrupted sleep or physical discomfort can affect how someone feels and functions during the day.
This page explores common symptoms, the different conditions in this category, and when to seek support.
Overview
- Sleep-related movement disorders do not all look or feel the same. Some cause an urge to move while resting, while others involve involuntary movements during sleep
- Symptoms can interfere with falling asleep or staying asleep. Some conditions also cause pain or discomfort after waking
- People may notice their symptoms directly, or a bed partner may be the first to recognize repeated movements during sleep
- The effects can extend beyond nighttime sleep, contributing to daytime fatigue, difficulty concentrating, or reduced quality of life
- Treatment depends on the specific condition – Identifying the cause can help people find effective ways to manage symptoms and improve sleep
Common signs and symptoms
Sleep-related movement disorders can cause different symptoms depending on the condition. Some are noticeable while resting or trying to fall asleep, while others occur during sleep and may go unnoticed.
While Resting or Trying to Sleep
- An uncomfortable urge to move the legs, particularly in the evening or at night
- Crawling, tingling, aching, or pulling sensations in the legs that improve with movement
- Difficulty settling down or falling asleep because of discomfort or the need to move
During Sleep
- Repeated kicking, jerking, or flexing of the legs or arms
- Sudden, painful muscle cramps, often in the calves or feet
- Teeth grinding or jaw clenching during sleep
- Repeated awakenings or disrupted sleep, sometimes noticed first by a bed partner
After Waking or During the Day
- Jaw pain, headaches, or tooth sensitivity
- Muscle soreness or lingering discomfort after nighttime cramps
- Fatigue, sleepiness, or difficulty concentrating after disrupted sleep
- Irritability or difficulty managing everyday activities
Not everyone experiences the same symptoms. Some movement disorders mainly cause physical discomfort, while others interfere with sleep without the person being aware of the movements.
Conditions in this category
Explore the conditions below to learn more about their symptoms and treatment options.
Why movement disorders matter across 24 hours
Sleep-related movement disorders can affect more than a good night’s rest. Disrupted sleep or physical discomfort can make it harder to feel rested and function well during the day. For some people, ongoing symptoms can interfere with work, relationships, or activities they enjoy.
The relationship can also work in the other direction. Stress, medications, and daily habits can influence symptoms in some conditions. For example, long periods of sitting can make restless legs syndrome worse, while certain habits may contribute to nighttime jaw clenching or teeth grinding.
Looking at the full 24 hours can help identify patterns and opportunities to manage symptoms. With appropriate care and adjustments to daily routines, many people can improve their sleep and quality of life.
When to seek help
You do not need to know what is causing your sleep difficulties before asking for help. Talk with a healthcare professional if sleep problems persist, become more frequent, or begin to affect your health, mood, or daily activities. Many sleep problems can be treated, and getting support can help you find the right approach.
Red flag: Seek prompt medical or dental care for:
- Falling asleep while driving or during safety-sensitive activities
- New weakness, numbness, swelling, redness, injury, or severe pain
- Jaw locking, major tooth damage, or difficulty eating
- Movements associated with falls, injury, or violent dream enactment
- Symptoms or sleepiness that causes severe distress or thoughts of self-harm
- Symptoms beginning after a medication change
- Major changes in mood, behavior, school performance, or daytime alertness
Assessment and diagnosis
Diagnosing sleep-related movement disorders begins with understanding a person’s symptoms and when they occur. A healthcare professional may ask about uncomfortable sensations, nighttime movements, pain, and how symptoms affect sleep or daily life. They may also review medications, medical conditions, and sleep habits.
The assessment depends on the suspected condition:
- Restless legs syndrome (RLS): Diagnosis is usually based on symptoms, particularly the urge to move the legs that worsens during rest and improves with movement. Blood tests to assess iron levels may also be recommended.
- Periodic limb movement disorder (PLMD): An overnight sleep study can measure repeated limb movements and determine whether they are associated with sleep disruption. Other possible causes must also be considered.
- Sleep-related leg cramps: Diagnosis is generally based on a person’s description of sudden, painful muscle contractions during sleep.
- Sleep bruxism: A dental examination can identify signs of tooth wear or jaw problems. Additional assessment may be needed if symptoms suggest another sleep disorder.
Not everyone needs specialized sleep testing. Identifying the specific condition helps guide appropriate treatment and management.
Bogan, R. K., Roy, A., Kram, J., et al. (2023). Efficacy and safety of tonic motor activation for medication-refractory restless legs syndrome: A randomized clinical trial. Sleep, 46(10), zsad190. https://doi.org/10.1093/sleep/zsad190
Didriksen, M., et al. (2024). Genome-wide meta-analyses of restless legs syndrome yield insights into genetic risk and biology. Nature Genetics, 56, 1487–1497. https://doi.org/10.1038/s41588-024-01763-1
Hallegraeff, J. M., van der Schans, C. P., de Ruiter, R., & de Greef, M. H. G. (2012). Stretching before sleep reduces the frequency and severity of nocturnal leg cramps in older adults: A randomised trial. Journal of Physiotherapy, 58(1), 17–22. https://doi.org/10.1016/S1836-9553(12)70068-1
Lobbezoo, F., Ahlberg, J., Raphael, K. G., et al. (2018). International consensus on the assessment of bruxism: Report of a work in progress. Journal of Oral Rehabilitation, 45(11), 837–844. https://doi.org/10.1111/joor.12663
Maisonneuve, H., Chambe, J., Delacour, C., et al. (2016). Prevalence of cramps in patients over the age of 60 in primary care: A cross-sectional study. BMC Family Practice, 17, 111. https://doi.org/10.1186/s12875-016-0509-9
Sakai, T., Kato, T., Yoshizawa, S., et al. (2017). Effect of clonazepam and clonidine on primary sleep bruxism: A double-blind, crossover, placebo-controlled trial. Journal of Sleep Research, 26(1), 73–83. https://doi.org/10.1111/jsr.12442
Seifen, C., Scholz, H., Fietze, I., et al. (2024). Periodic limb movements in patients with suspected obstructive sleep apnea without comorbid conditions. Journal of Clinical Sleep Medicine, 20(5), 753–761. https://pubmed.ncbi.nlm.nih.gov/38737757/
Winkelman, J. W., Berkowski, J. A., DelRosso, L. M., et al. (2025). Treatment of restless legs syndrome and periodic limb movement disorder: An American Academy of Sleep Medicine clinical practice guideline. Journal of Clinical Sleep Medicine, 21(1), 137–152. https://doi.org/10.5664/jcsm.11390
This article is for educational purposes only and is not intended to replace professional medical advice, diagnosis, or treatment. Speak with a qualified healthcare professional about questions or concerns related to your sleep. Read full medical disclaimer