Why do your arms and hands go to sleep?

The feeling of "falling asleep" in the arms and hands, also known as paresthesia, occurs when a nerve is compressed or irritated, disrupting the transmission of signals between the nerve and the brain. Here are a few common reasons why your arms and hands might go to sleep:

1. Sustained Pressure: Prolonged pressure on a nerve can temporarily affect its function. This can happen when you lean or rest on your arm for an extended period.

2. Nerve Compression Syndromes: Certain medical conditions, such as carpal tunnel syndrome, cubital tunnel syndrome, or thoracic outlet syndrome, can compress nerves in specific areas (e.g., wrists, elbows, or shoulders), causing tingling or numbness in the arms and hands.

3. Awkward Positions: Holding your arm or hand in an awkward position for a prolonged time, such as sleeping with your arm tucked underneath your head, can put pressure on the nerves and lead to temporary loss of sensation.

4. Circulatory Issues: Poor circulation due to conditions like atherosclerosis (hardening of arteries) can restrict blood flow to the nerves, causing them to malfunction and result in paresthesia.

5. Diabetes: Diabetes can cause nerve damage (diabetic neuropathy) that may affect sensation in the hands and feet.

6. Vitamin Deficiencies: A lack of certain vitamins, especially B12 and B6, can lead to nerve problems and numbness or tingling in the limbs.

7. Trauma: Injuries or fractures in the arm or hand can damage nerves, leading to paresthesia.

It's important to note that persistent or severe numbness in the arms and hands should be evaluated by a healthcare professional, especially if it's accompanied by weakness, pain, or other concerning symptoms. They can determine the underlying cause and recommend appropriate treatment.