Why Your Shoulder Hurts at Night (And What to Do About It)

You can make it through the day just fine. But the moment you lie down, your shoulder starts throbbing. If this sounds familiar, you’re not alone — and it’s not random.

Why Shoulders Hurt More at Night

Three things happen when you lie down that make shoulder pain worse:

1. Gravity stops helping. During the day, your arm hangs down, which creates natural traction in the shoulder joint. Lying down removes that decompression.
2. Blood flow increases. When you’re horizontal, more blood flows to the shoulder, which increases inflammation and pressure in already-irritated tissues.
3. You stop moving. Movement during the day keeps the joint lubricated. Staying still for hours lets inflammatory fluid accumulate.

The Most Common Causes

Rotator Cuff Tendinopathy

This is the number one cause of night shoulder pain. The supraspinatus tendon sits in a tight space that gets compressed when you lie on it. Even lying on the opposite side can cause pain because gravity pulls the arm across the body.

Read more: Rotator Cuff Recovery Guide

Shoulder Impingement

The tendons and bursa in your shoulder get pinched between bones when your arm is in certain positions. Side sleeping puts your shoulder in the worst position for impingement.

Read more: Shoulder Impingement Exercises

Frozen Shoulder (Adhesive Capsulitis)

Night pain is often the first sign of frozen shoulder, sometimes appearing weeks before you notice stiffness. The inflammation in the joint capsule is more noticeable when other stimulation dies down.

Read more: Frozen Shoulder Recovery

What to Do Tonight

These adjustments help most people sleep better immediately:

Exercises That Help

The goal is reducing inflammation and restoring space in the joint. These exercises, done consistently for 2-4 weeks, reduce night pain in most people:

Pendulum Swings

Lean forward, let your arm hang, and gently swing in small circles. 30 seconds each direction, twice daily. This creates gentle traction without loading the irritated tendons.

Isometric External Rotation

Stand next to a wall with your elbow bent 90 degrees. Push the back of your hand into the wall and hold for 10 seconds. Repeat 10 times. This strengthens the rotator cuff without painful movement.

Sleeper Stretch

Lie on the affected side with your arm at 90 degrees. Use your other hand to gently push your forearm toward the bed. Hold 30 seconds, repeat 3 times. This improves internal rotation, which is often restricted.

When to Get Help

See a physical therapist if:

• Night pain persists beyond 2-3 weeks despite these changes
• You can’t raise your arm above shoulder height
• You notice weakness when lifting objects
• The pain started after a fall or injury

Take our free shoulder assessment to find out which exercises match your specific shoulder condition.