Should you wear a carpal tunnel splint at night?

Yes, for most people with mild or moderate symptoms, a wrist splint worn at night is the usual first step. The NHS advises it, and it keeps the wrist straight during the hours when many people wake with numbness. The evidence that it helps is weak, though, so treat it as a trial of about six weeks rather than a guaranteed fix.

A night splint is the advised first step because it keeps the wrist straight

The NHS advises wearing a wrist splint at night to relieve pressure on the nerve, and says it may take up to six weeks before symptoms start to improve ¹.

The timing fits the symptoms. Numbness and pain in the thumb, index, middle and ring fingers often wake people at night ², so that is when the splint is most needed.

Our guide to carpal tunnel treatment sets the splint in the order of care: it is the first step for mild and moderate cases, and the step after it depends on how you respond.

The trial evidence is weak, and the first three months may show little change

The advice is stronger than the trial evidence. The 2023 Cochrane review pooled randomized trials of adults with carpal tunnel syndrome. Its finding on symptoms is that splinting may give little or no symptom benefit in the first three months ³.

Some people do feel better. In the review, people who wore a night-time splint tended to say their overall condition had improved, compared with people who did not wear one ⁴. The review treats that finding as uncertain. It is a reason to try a splint, not proof that it changes the nerve.

So the honest answer is that a splint is worth wearing, but it may not give quick relief. If you have no change after about six weeks, that is the point to see a clinician, not to assume the splint has failed for good.

Wear time matters, and night wear is not clearly worse than all-day wear

Wearing a splint for longer is not clearly better. Full-time splinting may not improve outcomes compared with night-time splinting ⁵. So the default is to wear the splint at night, as the NHS advises, rather than all day.

Duration is a separate question. One study in the review found that six months of splinting may improve symptoms and function compared with six weeks ⁶. That is one study, so it does not settle how long to wear a splint. Ask your clinician whether a longer schedule suits your case if the first six weeks help but do not finish the job.

Side effects can be temporary, but a splint that wakes you needs review

Splints can cause temporary side effects. The review says splinting may cause difficulty falling asleep or transient tingling after removal, and that none of the trials reported serious side effects ⁷.

If a splint keeps you awake, do not simply stop wearing it. Take the problem to a clinician or a hand therapist, who can check the fit, the wrist position or the type of splint. The trial evidence does not show which brace works best, so choose one that fits and keeps the wrist straight. Our guide to the best brace for carpal tunnel covers what to look for.

It depends: when a splint is not enough, and when to see someone sooner

A night splint is the first step for mild to moderate symptoms. It is not the right plan on its own in every case:

• Constant numbness or a weak thumb is a reason to see a clinician without waiting out the full six weeks. In severe cases, skin sensation can be permanently reduced, and compression can cause muscle wasting at the base of the thumb ⁸.
• Symptoms that get worse or do not go away are also a reason to see your GP.
• Symptoms that stay the same after six weeks call for a review of the options, which may include an injection or surgery. Our question on whether steroid injections help carpal tunnel covers the injection option.

Whether symptoms may settle without any treatment is a separate question, covered in whether carpal tunnel can go away on its own.

What to do with a night splint

1. Wear it at night from the start. Keep it on while you sleep, as the NHS advises, and do not wait until symptoms are bad.
2. Keep a simple record. Each morning, note whether you woke with numbness, how long it lasted, and whether gripping a mug or a bag has become harder.
3. Review at about six weeks. If the record shows no change, book a review with your GP.
4. Raise any sleep problems early. If the splint keeps you awake, ask for a check of the fit or the type, rather than giving up on splinting.
5. Plan the rest of your day. A splint helps the night; the day still needs fewer repetitive movements. Our guide to dictation for RSI and carpal tunnel explains how to move typing to your voice while you recover.

For the question of whether the exercises that often go with a splint help, see whether carpal tunnel exercises work.