CPAP pillow allows you to move freely while sleeping without displacing your CPAP mask. CPAP pillow can be used with a full face mask, nasal mask, or nasal pillow. The Carex CPAP Pillow is a high quality foam pillow with an ergonomic design which supports the head and neck properly, while allowing space for all major CPAP Mask models; A great sleep pillow and neck support pillow for back and side sleepers.