Is your recovery window still open? Free one-page chart ↓
Your Nerve Gets Eight Hours of Peace a Night. Or Eight Hours of Squeeze.
A cubital tunnel night splint stops the elbow BENDING FULLY while you sleep, usually holding it at around 30 to 45 degrees. Wear it every night, all night, for about 3 months. If the tingling in your ring and little fingers is going to settle with a splint, most people notice nights getting easier somewhere between week 4 and week 8.
Bending the elbow stretches the ulnar nerve and squeezes it in its groove. Many people sleep with their elbows tightly bent for hours, which is why ring and little finger tingling is often worst at night and on waking.
Most of us sleep like a T-Rex. Elbows bent tight, hands tucked under the chin or the pillow. Fine for a T-Rex. Not great for an ulnar nerve that’s already irritated.
Here’s the catch. Tingling that comes and goes is a nerve asking for room. Numbness that never leaves, or a hand that’s getting weaker, is a nerve that’s been squeezed too long. Wait through that stage and some of the muscle strength may not come back, even after surgery.
So the splint isn’t a gadget. It’s the cheapest, earliest tool you have, and it works best when you start it while the symptoms still come and go.
Why does bending the elbow make my fingers tingle?
The ulnar nerve runs behind the inner elbow, through a tunnel of bone and tissue. That’s your funny bone. See the nerve map for where it goes after that: the ring finger, the little finger and most of the small muscles inside the hand.
- Bending the elbow fully lengthens the path the nerve takes and narrows the tunnel around it. Stretched and squeezed at the same time.
- Pressure on the inner elbow, such as leaning on a desk, an armrest or a car window ledge, adds compression from the outside.
- Hours in that position every night keep the nerve irritated even if your day is fine.
Many people fix the day and forget the eight hours they spend asleep with their elbows bent.
Who is a night splint for?
- Cubital tunnel syndrome with tingling in the ring and little fingers that comes and goes.
- Symptoms that wake you, or that are there first thing in the morning and fade as you move. See hands numb at night to check it’s the ulnar nerve and not the median nerve (thumb, index and middle finger point to carpal tunnel instead).
- People who lean on their elbows at work or rest the arm on a window ledge. See professional drivers.
- Mild to moderate cases. For constant numbness or weakness, a splint can still be part of the plan, but it shouldn’t be the whole plan.
How is cubital tunnel diagnosed?
Usually in the clinic first, scans and tests second.
- The pattern. Ring and little finger, worse with the elbow bent, worse at night or on the phone.
- Tapping over the nerve behind the inner elbow sends tingling into the little finger.
- The elbow flexion test. Elbow fully bent, wrist straight, held for up to a minute. If that brings your symptoms on, the elbow is a strong suspect.
- Strength checks. Pinching a sheet of paper between thumb and index finger, spreading the fingers apart, and looking at the muscle in the web between thumb and index.
- Nerve conduction tests if symptoms are constant, there’s weakness, surgery is being discussed, or the splint trial hasn’t helped. See nerve conduction tests explained.
What kind of night splint should I use?
- Custom thermoplastic splint. Molded on the front of the elbow by a hand therapist, holding a set angle. Firm, reliable, and the angle is chosen for your arm.
- Padded elbow sleeve with a firm insert. Softer and easier to sleep in. Fine if it actually stops you bending past about 45 degrees. Many soft ones don’t.
- A towel wrapped around the front of the elbow and taped, as a free first trial. Bulky enough that the elbow can’t fold fully. Ugly, effective, costs nothing.
- A pad over the inner elbow for daytime leaning. This protects against pressure. It does nothing for bending.
(The towel trick is ugly. It is also free, so try it for a week before you buy anything.)
Whatever you use, the test is simple: lie down in it and try to bring your hand to your shoulder. If you can, it isn’t doing the job.
How many hours a day do I wear it?
- Every night, all night. The splint protects the eight hours you can’t control. Skipping nights resets the nerve’s progress.
- Daytime: usually not needed. Change the habits instead (see below). Some people with a desk job or a long drive use a soft elbow pad by day.
- Expect a week or two of bad sleep while you get used to it. That settles for most people. Sleeping on your back or on the opposite side helps.
- Skin check each morning. Red marks that fade within 30 minutes are fine. Marks that last, or blisters, mean a strap is too tight or an edge needs adjusting.
How long until a cubital tunnel splint works?
This is the window. Your condition runs on one, and the splint trial is how you find out where you are in it.
- Weeks 0 to 4 (window OPEN): splint every night, daytime habits changed. Sleep gets easier once you’re used to it. Don’t judge it yet.
- Weeks 4 to 8 (still open): night symptoms usually start to ease if it’s going to work. Waking up with tingly fingers less often is the first sign.
- Weeks 8 to 12 (decision point): review. Improving means continue. No change means further assessment, usually nerve tests, and a conversation with a hand surgeon.
- After 3 months, if it’s working: keep it for bad nights. Many people stop, notice symptoms creeping back after a few weeks, and go back to it. That’s normal, not a failure.
If at any point the numbness stops coming and going, or the hand gets weaker, the window is CLOSING. Don’t sit out the rest of the 3 months. Get reassessed.
What else should I change during the day?
- Keep the elbow off hard edges. Desks, armrests, car doors. Lean on your forearm, not the inner elbow.
- Phone calls on headphones or speaker. Holding a phone to your ear keeps the elbow bent past 90 degrees for the whole call.
- Open the elbow at the desk. Move the keyboard and mouse a little further away so the elbow sits around 90 to 100 degrees, not tightly bent.
- Break up long bent-elbow tasks (driving, gaming, reading on a tablet) every 20 to 30 minutes: straighten the arm, open the hand, then carry on.
Are there exercises for cubital tunnel?
Gentle ones. The nerve is irritated, so the rule is: never push into tingling.
- Elbow straighten-and-open. Sitting tall, arm by your side, slowly straighten the elbow fully and open the fingers wide, then relax. 10 slow reps, 2 to 3 times a day. This is the opposite of your sleeping posture, and it’s free.
- Gentle nerve glide. Arm out to the side at shoulder height, palm up, elbow straight. Slowly bend the elbow to about 90 degrees while tipping your head toward that shoulder, then straighten while tipping the head away. 5 slow reps, twice a day. Stop if it brings on tingling, and leave it out if your symptoms are constant.
- Finger spreading. Hand flat on the table, spread the fingers apart and bring them back together. 10 reps, twice a day. It keeps the small hand muscles that the ulnar nerve powers working while you wait.
Aggressive nerve flossing, hanging stretches and strengthening through pain make an irritated ulnar nerve angrier, not happier.
Can I work, drive and go to the gym with cubital tunnel?
- Desk work: yes. Fix the elbow position and the leaning, and take the breaks.
- Driving: yes, it’s a night splint, you don’t drive in it. Keep your elbow off the window ledge and lower your hands on the wheel so the elbows sit more open.
- Manual work: usually yes. Avoid long spells with the elbow fully bent and leaning on the inner elbow.
- Gym: most training is fine. Go easy on exercises that hold the elbow fully bent under load for long sets, and stop if the little finger starts tingling mid-set.
When does cubital tunnel need surgery?
A splint is the first treatment, not the last one.
- Constant numbness that no longer comes and goes.
- Weakness: clumsy fingers, dropping things, trouble with buttons or pinching.
- Wasting: a hollow appearing in the web between thumb and index finger, or between the bones on the back of the hand.
- 3 months of a proper splint trial with no change.
Any of those is a reason for a surgical opinion, not more waiting. See cubital tunnel release and transposition recovery for what happens next. If the fingers have started to claw, see the anti-claw splint.
What a hand therapist does differently
- Sets the angle for your arm, not a one-size sleeve that still lets you fold up at 3am.
- Finds the daytime culprit. Usually it’s one habit: the phone, the armrest, the car window.
- Measures the hand, pinch strength and finger spreading, so you know whether the window is still open or quietly closing.
This is one of dozens of splints a hand therapist makes. See what a hand therapist does for the full list.
Get it checked today if
- Sudden weakness or numbness in the hand after an elbow injury or a fall.
- Numbness spreading beyond the ring and little fingers, or into both hands, or with neck pain and arm weakness.
- The splint leaves skin broken, blistered or numb in a new spot.
Get it checked if
- Weakness in the hand, clumsiness or dropping things.
- Visible wasting in the web between thumb and index finger.
- Numbness that no longer comes and goes.
- Ring and little fingers starting to curl. Constant symptoms and weakness usually need a surgical opinion.
- No improvement after 8 to 12 weeks of nightly splinting.
Positions, pillows and what to do with the other arm are in how to sleep with cubital tunnel syndrome.
Keep the elbow a little straighter at night and give the nerve three months. Not three years.
Written by Nigel Chua, hand occupational therapist in practice since 2005. Thousands of hands, wrists and elbows assessed and treated. My credentials are here. This article explains; it doesn’t examine. Tingling that comes and goes is a different conversation from numbness that stays, so get the second one looked at.
Part of: Hand, wrist and elbow splints: which one, why and how long
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.