Side sleeping can be a comfortable position for many people using CPAP, but the mask and hose need room to move with you. The most useful pillow features combine shoulder clearance, stable neck support and a route for tubing.
Look for side cut-outs
Recesses can reduce pressure on the mask when you turn. They may also give the hose a more direct path toward the head of the bed. Choose a cut-out that matches your mask shape rather than assuming every design will work.
Keep the neck supported
Your head should remain level with your spine, with enough space for the shoulder. A pillow that is too tall can bend the neck; one that collapses can leave the face pressed into the mask. Adjust loft gradually.
Reduce movement at the source
Check that the mask straps are correctly adjusted and that the hose is supported without pulling. A pillow helps manage contact points, but repeated leaks may require a mask refit or therapy review.
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