I had a compressed disc in college, & my mom's chiro gave very specific tips:

Always keep your bottom to the rear of the chair [or, why my feet always dangle in the air]. Keep your knees higher than your hips. Sleep on your side in a fetal position with a pillow between your knees.

That's why, although most folks with a compressed disc get more than one, I never have.

I hope your shoulder's doing better.