What might cause twitching of arms and legs while sleeping?

Reviewed by Yoshinori Abe, MD

Internal Medicine

Twitching of the arms and legs during sleep is most often caused by two conditions: periodic limb movement disorder (PLMD), which is especially common in older adults, and restless legs syndrome (RLS). Both can disrupt sleep quality and may point to underlying issues like iron deficiency, nerve problems, or medication side effects.

Because symptoms overlap with other conditions—and because untreated sleep disturbances can affect your daytime energy, mood, and long-term health—it's worth investigating further. A free, instant, online symptom check can help you identify possible causes, understand urgency, and decide whether to see a doctor. It takes just a few minutes and could save you weeks of uncertainty.

Reviewed for medical accuracy: 07/14/2026

Important Next Steps

Learn what causes twitching arms and legs Discover if your twitching needs medical care See if twitching could signal something serious Find OTC options for muscle twitching relief Find a doctor for muscle twitching Explore medically proven home remedies for twitching Understand likely causes of twitching arms and legs

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Explanation

Twitching of arms and legs during sleep can happen for several reasons. One common cause is Periodic Limb Movements during Sleep (PLMS), which often affects older adults. These are repetitive movements, usually in the legs, that can disturb sleep. Another reason for twitching is Restless Legs Syndrome (RLS), a condition that creates an urge to move the legs, often felt as discomfort or tingling. Some medications can make RLS worse or even cause it.

Factors Influencing Twitching:

Age: Older adults are more likely to experience periodic limb movements during sleep.
Medications: Certain medications can induce or worsen restless legs syndrome.
Lifestyle Factors: Alcohol use can also affect limb movements during sleep.

If twitching during sleep is frequent or bothersome, you can start by using a free symptom checker to better understand what might be causing your symptoms, then talk to a healthcare provider to explore potential causes and find ways to improve sleep quality.

(References)

Bliwise D, Petta D, Seidel W, & Dement W. (1985). Periodic leg movements during sleep in the elderly. Archives of gerontology and geriatrics, 4074025.
Page RL 2nd, Ruscin JM, Bainbridge JL, & Brieke AA. (2008). Restless legs syndrome induced by escitalopram. Pharmacotherapy, 18225972.
Aldrich MS, & Shipley JE. (1993). Alcohol use and periodic limb movements of sleep. Alcoholism, clinical and experimental research, 8452202.

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