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The PAPillow is a great compliance aid for side and stomach sleeping CPAP users. It's unique shape allows the user's mask and tubing to extend beyond the pillow eliminating the interference between the mask and pillow. This void area, makes it so the CPAP mask does not press into the pillow and cause pressure point soreness against the user's face, which is all to common with CPAP use. Also the unique and patented shape of the PAPillow, virtually eliminates mask leaks for side and stomach sleepers.