Why do my hands go numb in my sleep?
Almost everyone has woken at some point with a hand that feels dead after lying on it. That kind of numbness comes from simple pressure on a nerve and clears within a minute or two of moving. It is a nuisance, not a diagnosis.
It is different when it happens most nights, when the same fingers are affected each time, or when you find yourself shaking the hand to get the feeling back. A repeating pattern like that suggests a nerve that is already under strain, and the most common reason by far is carpal tunnel syndrome.
In carpal tunnel syndrome the median nerve is compressed as it passes through a narrow channel at the front of the wrist. The nerve supplies feeling to the thumb, index and middle fingers and part of the ring finger, so that is where the tingling, pins and needles or numbness usually sits.
Why is carpal tunnel worse at night?
Several things come together during sleep. Many of us sleep with the wrists bent, either curled under the chin or tucked under a pillow, and a bent wrist narrows the carpal tunnel further. Fluid also tends to shift into the hands when you lie flat for hours, and you are not moving the hand to relieve the pressure as you would during the day.
The result is that symptoms which are mild or absent in the daytime can be strong enough to wake you in the early hours. Waking with numbness in the hand, then needing a few minutes before it feels normal, is one of the most typical stories doctors hear in carpal tunnel syndrome.
Sleeping position, carpal tunnel, cubital tunnel or the neck?
Not every numb hand at night is carpal tunnel. Which fingers are affected is one of the most useful clues, and it is worth paying attention to the pattern before you see anyone.
Pressure on the ulnar nerve at the elbow, known as cubital tunnel syndrome, tends to affect the little finger and the outer half of the ring finger. It is often worse when you sleep with the elbows bent tightly for long periods. A trapped nerve root in the neck, called radiculopathy, can cause numbness in the hand too, but it often comes with neck pain, an ache spreading down the arm, or symptoms that change when you turn your head.
Does a night splint help?
A wrist splint worn at night keeps the wrist straight rather than bent, which takes some of the pressure off the median nerve while you sleep. For mild or early carpal tunnel symptoms, many people find it noticeably reduces night waking, and it is a sensible first step.
Splints are widely available from pharmacies. Look for one that holds the wrist in a neutral, straight position rather than tilted back, and wear it every night for several weeks to judge the effect. If symptoms carry on despite regular use, or if numbness is starting to linger into the daytime, the splint is not enough on its own and the nerve should be assessed.
When to get a nerve test
A nerve conduction study measures how well signals travel along the nerves in your arm and hand. It shows whether the median nerve is slowed at the wrist, and how badly, and it can also check the ulnar nerve at the elbow and look for signs that point towards the neck instead. The EMG part looks at the muscles the nerves supply.
This matters because treatment depends on the site and the severity. A mild case may be managed with a splint, while moderate or severe compression often needs an injection into the carpal tunnel or a release operation. On the NHS, waits for nerve conduction studies are often long. Privately, you can book a test without a GP referral.
When to see your GP or get urgent help
Your GP is a good first port of call for new or worsening hand symptoms, and NHS 111 can advise if you are unsure where to go. Please do not wait if numbness is spreading, getting steadily worse or affecting your ability to use the hand.
Call 999 straight away if numbness or weakness comes on suddenly, especially down one side of the body, with a drooping face, slurred speech or confusion. These can be signs of a stroke and need emergency care, not a nerve test.
Common questions
Why do I get numbness in my hand when I wake up? +
Most often because the wrist has been bent for hours during sleep, which squeezes the median nerve in the carpal tunnel. If it happens most mornings in the thumb, index and middle fingers, carpal tunnel syndrome is the usual cause and is worth checking.
Is it normal for both hands to go numb at night? +
Carpal tunnel syndrome often affects both hands, though one side is usually worse. Numbness in both hands can occasionally have other causes, such as a problem with the nerves more generally, which a nerve conduction study can help to explore.
Can I just change my sleeping position? +
Keeping your wrists straight and avoiding sleeping with your hands tucked under you can help, and a night splint makes that easier. If numbness carries on despite this, the nerve is likely to be under ongoing pressure and should be assessed.
Do I need a GP referral for a nerve conduction study? +
Not for a private test. At Bridge House Clinic in Rossett you can book a consultation and nerve conduction study with EMG directly. The fee is published: Consultation + nerve conduction study & EMG — upper limbs £450.
Is the nerve test uncomfortable? +
Most people find it manageable. The nerve conduction part uses brief electrical pulses that feel like a tap or flick, and the EMG uses a fine needle in a few muscles. The consultant explains each step as it happens and you can pause at any time.
