Last Updated on June 14, 2026
Hands that go numb at night are most often caused by a trapped nerve — usually carpal tunnel syndrome (thumb side) or pressure on the ulnar nerve at the elbow (little-finger side).
Which fingers are affected, and what brings the numbness on, usually point to the cause — and a nerve conduction study confirms it. This page helps you work out which nerve is likely involved, what to try, and when to get it checked.
Which fingers go numb?
This is the most useful clue. Next time your hand is numb, try to scratch the affected fingers and notice exactly which ones are involved — the brain can make it feel like the “whole hand,” especially when you are half-asleep.
- Thumb, index and middle finger — points to the median nerve (carpal tunnel syndrome).
- Ring and little finger — points to the ulnar nerve (the “funny bone” nerve at the elbow).
- A wider or changing pattern, or symptoms in the arm — can come from a pinched nerve in the neck (or, rarely, the spinal cord or brain).
It also helps to notice what brings it on: gripping or bending the wrist, leaning on the elbow, or holding the neck a certain way.
The common causes
✋ Carpal tunnel syndrome
Thumb-side numbness, mainly at night; eases when you shake or hang the hand down, worse with gripping or bending the wrist. Try a night splint to keep the wrist straight, and get a nerve conduction study to confirm.
💪 Ulnar nerve (at the elbow)
Little-finger-side numbness; worse leaning on the elbow, better with the elbow held straight. Try not leaning on the elbow and keeping it straight at night, and get a nerve conduction study.
🦴 Neck (cervical) nerve
A pinched nerve in the neck can numb the thumb side (C6), the middle/ring fingers (C7), or other areas. This usually needs a neurologist’s review and may need a CT or MRI.
What should I do?
Simple measures often help to start with — a night wrist splint for suspected carpal tunnel, or keeping the elbow straight for ulnar symptoms. The key test to pin down the diagnosis is a nerve conduction study, which measures how well the nerves are working and shows whether there is damage to the nerve lining (a demyelinating pattern) that is treated differently. For detailed test information, see carpal tunnel testing.
Most night-time hand numbness comes from a treatable trapped nerve — not something sinister — and simple steps plus the right test usually sort out the diagnosis quickly.
Frequently asked questions
Why do my hands go numb at night?
Most often it is a trapped nerve — usually carpal tunnel syndrome (thumb side) or pressure on the ulnar nerve at the elbow (little-finger side). Sleeping positions that bend the wrist or elbow tend to bring it on.
Is numbness in my hands at night carpal tunnel?
It may be, especially if the thumb, index and middle fingers are affected, it is worse with gripping, and it eases when you shake the hand. A nerve conduction study confirms it.
Which fingers go numb in carpal tunnel syndrome?
Typically the thumb, index and middle finger (and the thumb side of the ring finger) — the area supplied by the median nerve.
How is the cause diagnosed?
By the pattern of symptoms plus a nerve conduction study, which is the gold-standard test. If a neck nerve is suspected, a CT or MRI may be needed.
When should I see a neurologist?
If symptoms are persistent, waking you regularly, spreading, or associated with weakness or wasting of the hand muscles, it is worth a review and a nerve conduction study.
Book a nerve conduction study
A nerve conduction study at East Neurology can confirm exactly which nerve is affected and guide treatment. Ask your GP for a referral, then get in touch.
Or call 02 9388 0615. East Neurology is a private specialist practice focused on expert diagnosis and prompt results; your Medicare rebate is processed for you on the day.