Side sleeper pillows having upper anatomy stabilizing features

A side sleeper pillow, comprising:

• a main pillow body having primary head support region, a proximal peripheral wall facing the sleeper's body when using the side sleeper pillow, a distal peripheral wall opposed from the proximal peripheral wall as taken along a longitudinal axis, and first and second lateral sidewalls opposed along a lateral axis perpendicular to the longitudinal axis;
• a gap stabilizing shelf projecting from an upper portion of the proximal peripheral wall in a distal direction and extending between the lateral sidewalls along the lateral axis;
• and
• a shoulder-receiving opening formed the gap stabilizing shelf, the shoulder-receiving opening intersected by a midline plane extending parallel to the longitudinal axis and perpendicular to the lateral axis, the shoulder-receiving opening sized and positioned to receive a shoulder of the sleeper when using the side sleeper pillow in a side sleeping position.

A side sleeper pillow, comprising:

• a main pillow body having a centerline and bisected by a midline plane containing the centerline;
• a primary head support region provided on the main pillow body;
• a gap stabilizing shelf projecting from an upper portion of the proximal peripheral wall in a distal direction and extending between the lateral sidewalls along a lateral axis perpendicular to the midline plane;
• a sub-shelf channel extending beneath the gap stabilizing shelf and bordered by the proximal peripheral wall of the main pillow body;
• and
• first and second laterally-open depressions positioned on opposing sides of the midline plane, the first and second laterally-open depressions breaching the first and second lateral sidewalls of the main pillow body, respectively.