That odd tingling or numbness — the sensation of pins and needles — is something nearly everyone has felt at some point. Medically, it’s called paresthesia.
While many people assume it’s just from an awkward sleeping position, it can occasionally signal something more serious than a pinched nerve.
Let’s explore why your hands might go numb while you sleep, and when it could be a cause for concern.
What Is Paresthesia?
Paresthesia describes abnormal sensations like tingling, burning, prickling, or numbness, usually from nerve irritation or compression.
It’s often temporary, as when your arm “falls asleep,” but if it happens regularly, especially overnight, there may be an underlying problem.
10 Possible Reasons Your Hands Go Numb at Night
1. Carpal Tunnel Syndrome
Pressure on the median nerve from repetitive motion or bent wrists can cause tingling in the thumb, index, and middle fingers. Wearing a wrist brace may help.
2. Ulnar Nerve Compression
Sleeping with bent arms or arms tucked under your body can compress the ulnar nerve near the elbow, leading to numbness in the pinky and ring fingers.
Keeping the arm straight with pillows can reduce symptoms.
3. Vitamin B12 Deficiency
Low B12 levels may damage nerves, causing pins and needles. Vegans and vegetarians are more prone.
If you’re also tired or weak, consider a blood test.
4. Diabetic Neuropathy
High blood sugar harms peripheral nerves over time.
For people with diabetes or prediabetes, nighttime numbness can be an early warning sign.
