Your shoulder joint is surrounded by a capsule of connective tissue that holds everything together.
Think of it as a flexible sleeve wrapped around the ball of your shoulder, allowing you to move freely in every direction.
But here's what makes frozen shoulder particularly devastating: when that capsule becomes inflamed, it starts to thicken and tighten.
Unlike a pulled muscle or even a rotator cuff tear, frozen shoulder doesn't simply heal on its own.
The capsule contracts. Scar tissue forms. Movement becomes more and more restricted.
And here's the part that most doctors don't explain: the tightening accelerates while you sleep.
That's when inflammatory fluids pool around your shoulder. When the capsule has hours to stiffen without movement. When you wake up feeling worse than when you went to bed.
But for most people with frozen shoulder, sleep isn't providing the healing environment their shoulder needs. It's making things worse.