Numbness and Tingling in Your Hands at Night: Carpal Tunnel Explained

You're asleep, and then you're not — because your hand has gone numb, or your thumb and first two fingers are buzzing like they've fallen asleep on their own. You shake it out, flex your fingers, maybe hang your arm off the side of the bed, and after a minute or two it settles. Then it happens again a few hours later.

This is one of the most common reasons people come to see us with hand symptoms, and it usually has a straightforward explanation: carpal tunnel syndrome. It's not dangerous, and for most people it's very treatable once you understand what's actually going on.

What's happening inside your wrist

The carpal tunnel is a narrow passage on the palm side of your wrist, formed by small wrist bones on one side and a tight band of ligament on the other. Through this tunnel run nine tendons that bend your fingers, plus the median nerve — the nerve responsible for sensation in your thumb, index finger, middle finger, and half of your ring finger.

There isn't much spare room in that tunnel. If the tissues around the tendons become even slightly swollen or irritated, or if the tunnel is simply narrower than average, the median nerve gets compressed. A compressed nerve doesn't send clean signals — it sends static. That static is what you feel as numbness, tingling, or a pins-and-needles sensation, and sometimes a dull ache that can travel up the forearm.

Why it's so often worse at night

Patients are frequently puzzled that symptoms are mild during the day but severe at night. There are a few practical reasons for this.

Most of us sleep with our wrists bent — either curled under the pillow or flexed while lying on our side. Wrist flexion increases pressure inside the carpal tunnel more than almost any other position. Hold that position for hours without moving, and the nerve simply doesn't get a break.

Fluid also redistributes when you lie down. During the day, gravity keeps some fluid in your legs; overnight, more of it shifts toward your upper body and hands, adding to the pressure in an already tight space. And because there's no daytime activity to distract you, you're simply more likely to notice — and be woken by — a sensation that might otherwise go unnoticed.

Who tends to get it

Carpal tunnel syndrome is more common in people who do repetitive hand and wrist movements — typing, using a mouse for long stretches, cycling, racket sports, or manual trades involving vibration or gripping tools. It's also more common in pregnancy due to fluid retention, and in people with diabetes, an underactive thyroid, or inflammatory joint conditions. Sometimes there's no clear cause at all — some wrists are simply built with a tighter tunnel than others.

Desk workers are a group we see a lot at the clinic, particularly those who've recently increased screen time, changed desk setup, or started a new keyboard-heavy role. If that sounds like you, it's worth reading our guidance on pain relief for joint pain, which covers practical ways to manage symptoms that flare with repetitive strain, not just carpal tunnel specifically.

What actually helps

The good news is that mild to moderate carpal tunnel syndrome responds well to conservative treatment, and surgery is very much a last resort rather than a first step.

A night splint. Keeping your wrist in a neutral position while you sleep — not bent forward or back — is often the single most effective change you can make. It stops the compressive position that triggers most nighttime symptoms.

Nerve gliding exercises. Specific, gentle movements help the median nerve slide more freely through the tunnel rather than sitting compressed against the surrounding tissue. These need to be shown and progressed correctly, which is where a physiotherapy assessment is genuinely useful rather than relying on generic exercise sheets found online.

Reviewing how you use your hands during the day. Keyboard and mouse position, grip strength on tools, cycling handlebar position, and simple posture at a desk all influence pressure in the tunnel. Small adjustments — wrist supports, different tool handles, more frequent breaks — often make a real difference.

Building strength and capacity around the wrist and forearm. Once acute irritation has settled, a structured strength and conditioning programme helps the tendons and surrounding tissues tolerate load better, reducing the chance of symptoms returning.

For most people, a course of physiotherapy focused on nerve mobility, splinting advice, and load management resolves symptoms or reduces them to a manageable level within a matter of weeks. Where symptoms are severe, constant, or associated with muscle wasting at the base of the thumb, we'll refer you on for further investigation — but that's the exception rather than the rule.

When to get it checked

Waking once or twice with a numb hand isn't an emergency. But if it's happening most nights, if the numbness is starting to persist into the day, or if you're noticing weakness — dropping things, struggling to grip — it's worth having it properly assessed rather than waiting it out. Nerve symptoms that are left compressed for a long time can take longer to settle, so earlier assessment generally means a quicker, simpler recovery.

If your hands are keeping you up at night, come in and see us at our Vauxhall clinic. We'll work out exactly what's compressing the nerve, rule out anything else that might be contributing, and get you a plan that's realistic for your daily routine.