Carpal tunnel syndrome is worse at night because when people sleep, the wrist often bends, increasing pressure on the median nerve. Lying flat also causes fluid to shift into the hand and wrist, increasing swelling. Reduced movement at night and increased nerve sensitivity make pins and needles, numbness and carpal tunnel pain more noticeable. Keeping the wrist in a neutral position helps relieve pressure and reduce symptoms.
Understanding Carpal Tunnel Syndrome
Carpal tunnel syndrome occurs when there is pressure on the median nerve as it travels through the carpal tunnel in the wrist. This narrow tunnel is formed by wrist bones and the carpal ligament.
The nerve in your wrist (median nerve) provides sensation to the thumb, index and middle fingers, and part of the ring finger. When the nerve is compressed, it causes the classic symptoms of carpal tunnel syndrome.
These include:
- Pain or aching in the hand and wrist
- Numbness or pins and needles in the thumb, index and middle fingers
- Tingling that may extend into the ring finger
- Weakness or clumsiness when gripping objects
Why Are Carpal Tunnel Symptoms Worse at Night?
There are several reasons why carpal tunnel symptoms become more noticeable during sleep. Often, it is a combination of factors rather than a single cause.
1. Wrist Position During Sleep
One of the most important reasons symptoms are worse at night is wrist position. When people sleep, the wrist often bends forward or backward without them realising.
A wrist bent position increases pressure inside the carpal tunnel. This extra pressure reduces space for the median nerve, leading to increased compression and pain.
Keeping the wrist in a neutral position helps relieve pressure on the nerve, which is why a wrist splint is often recommended at night.
2. Reduced Movement During Sleep
During the day, regular hand and wrist movement helps fluid circulate and reduces pressure within the carpal tunnel. At night, when movement decreases, fluid can accumulate around the tendons.
This swelling further increases pressure on the median nerve, making symptoms more noticeable when you wake up.
3. Fluid Redistribution When Lying Down
When you lie flat, fluid shifts from the legs towards the upper body and arms. This can increase swelling in the hand and wrist, narrowing the carpal tunnel.
As a result, carpal tunnel pain and tingling may develop or worsen during the night, even if symptoms were mild during the day.
4. Reduced Distraction at Night
At night, there are fewer distractions. During the day, work and activity can mask symptoms, but once you are resting, even mild nerve irritation becomes more noticeable.
This does not mean the condition suddenly worsens at night, but rather that the symptoms become harder to ignore.
5. Inflammation and Nerve Sensitivity
Inflammation around the tendons inside the carpal tunnel can make the median nerve more sensitive. At night, this sensitivity may increase, contributing to tingling and burning sensations.
If left untreated, ongoing inflammation can increase the risk of nerve damage and long-term weakness.
How to Reduce Night-Time Carpal Tunnel Symptoms
Adjust Sleeping Position
Avoid sleeping on your hands or with your wrists tucked under pillows. Try to keep the arms relaxed and supported, especially if symptoms affect both wrists.
Cortisone Injection
If symptoms persist, a cortisone injection into the carpal tunnel can significantly reduce inflammation and nerve compression. This can provide weeks to months of relief.
When to Seek Specialist Assessment at Alton Pain Clinic
You should seek medical advice if:
- Night-time symptoms are frequent or worsening
- Pain, numbness or tingling affects daily activities
- Symptoms do not improve with a wrist splint
- Weakness or loss of grip strength develops
Persistent compression increases the risk of nerve damage, making early assessment important.
Why Cortisone Injections Matter in Carpal Tunnel Syndrome
At Alton Pain Clinic, ultrasound-guided cortisone injections play a key role in treating carpal tunnel syndrome when night pain, numbness or pins and needles persist despite splinting and medication.
Steroid injections work by reducing inflammation inside the carpal tunnel, which helps relieve pressure on the median nerve. This can quickly improve pain, numbness and tingling, especially when symptoms are worse at night.
Using ultrasound guidance allows precise placement of the injection around the nerve, improving effectiveness and reducing risk. For many patients, this provides significant pain relief, improves sleep, and may delay or avoid the need for surgery.
Early treatment is important, as ongoing nerve compression increases the risk of permanent nerve damage.
Summary
At Alton Pain Clinic, ultrasound-guided cortisone injections are an effective treatment for carpal tunnel syndrome when symptoms persist. The injection reduces inflammation, relieves pressure on the median nerve, eases pain and numbness, improves sleep, and helps prevent long-term nerve damage—often avoiding the need for surgery.
Frequently Asked Questions
What does a steroid injection do for carpal tunnel syndrome?
A steroid injection reduces inflammation inside the carpal tunnel, helping to relieve pressure on the median nerve. This eases pain, numbness and tingling, especially when symptoms are worse at night.
Why is ultrasound guidance important?
At Alton Pain Clinic, injections are ultrasound-guided, allowing precise placement around the nerve. This improves effectiveness, increases safety and reduces the risk of complications.
How quickly does pain relief start after the injection?
Many patients notice improvement within a few days, with symptoms continuing to ease over the following weeks as inflammation settles.