Hand numbness at night is almost always nerve compression, not poor circulation.
Which fingers go numb tells you which nerve.
- Thumb, index and middle point to the MEDIAN nerve at the wrist.
- Ring and little point to the ULNAR nerve at the elbow.
- All five fingers, both hands, or the feet as well, points somewhere else entirely.
That distinction decides what you do tonight.
Why it happens at night and not during the day
Three things change when you sleep.
- You lose voluntary control of your wrist and elbow position, so they drift into full bend and stay there for hours
- Tissue fluid redistributes when you lie flat, which raises pressure inside an already tight tunnel
- There is no movement to pump that fluid away
Bending the wrist fully roughly triples the pressure inside the carpal tunnel.
Bending the elbow past 90 degrees stretches and compresses the ulnar nerve at the same time. Hold either for four hours and the nerve stops conducting properly.
Hence the 3am wake-up, shaking the hand like an Etch A Sketch to get the feeling back. That shake has a name in clinic — the flick sign — and it is one of the more reliable things a patient reports.
1. Carpal tunnel syndrome
Thumb, index, middle, and half the ring finger. Never the little finger.
Night symptoms are usually the FIRST symptom, often for months before anything happens in the day. It wakes you, you shake it, it settles in a few minutes, you go back to sleep and forget about it by breakfast.
The window matters here. Numbness that comes and goes is a nerve being irritated. Numbness that is there all day, every day, with thumb muscle wasting at the base, is a nerve that has been damaged — and that recovers slowly and sometimes incompletely. See carpal tunnel syndrome.
2. Cubital tunnel syndrome
Little finger and half the ring finger. Often the back of the hand on that side too, which is the giveaway, because the nerve branch supplying that patch leaves before the wrist.
Sleepers who curl an arm under the pillow get this. So do side sleepers with the elbow pinned under their own body weight.
It is the one people most often mistake for carpal tunnel, and the treatment is different — the problem is at the elbow, so a wrist splint does nothing. See cubital tunnel syndrome, and Guyon’s canal for the version that happens at the wrist instead.
3. A neck problem pretending to be a hand problem
Numbness in a stripe rather than a glove. Down the arm, into one or two fingers, sometimes with neck or shoulder blade ache. Often worse with the head tilted or turned a particular way.
Nerve roots in the neck feed the hand, so a compressed root produces hand symptoms with a completely normal wrist. See cervical radiculopathy.
4. Thoracic outlet syndrome
The whole hand, often the inner forearm, worse with the arms overhead or carrying. Sleeping with an arm above the head reproduces it neatly.
Less common than the first two, and frequently diagnosed only after those have been ruled out. See thoracic outlet syndrome.
5. Peripheral neuropathy
Both hands, all fingers, and usually the feet first. Burning or numb rather than tingling. Present all night rather than triggered by position.
If your feet are involved, this is not a wrist problem. Diabetes, thyroid disease, B12 deficiency and some medications all sit behind this. See peripheral neuropathy or carpal tunnel, and the diabetic hand.
Thumb side, think wrist. Little finger side, think elbow. Both hands and both feet, think body.
What to do tonight
- Splint the wrist straight. A neutral night splint, not a compression sleeve. This is the single highest-yield thing for median nerve symptoms and it works while you are asleep, which is when the problem happens. See which splint, and how long
- Stop the elbow bending fully. A towel wrapped around the elbow and loosely taped is enough. Cheap, effective, and nobody sells it to you
- Change the arm position. Nothing under the pillow, nothing overhead
- Give it four to six weeks. Nerves respond slowly. Two nights tells you nothing
Most of the people I see with early night numbness have already bought a wrist brace, worn it for three days, and concluded it doesn’t work.
When to stop managing it yourself
- Numbness that no longer comes and goes — it is constant
- Visible hollowing of the muscle at the base of the thumb, or fingers starting to claw
- Dropping things, or losing the ability to feel what you are holding
- Sudden numbness with weakness, speech change or facial droop — that is an emergency, not a hand problem
- Numbness after a fall or fracture, which needs looking at now rather than in six weeks
Intermittent numbness is a nerve asking for room. Constant numbness is a nerve that has stopped being able to ask.
If you want to work out which nerve serves which patch of your own hand, start with the nerve map of the hand.
Every article on this site is written using the Closing Window Method: name the window your condition runs on, find where you are in it, and act while it’s still open.