Hearing your heartbeat while lying on your side is typically normal. According to Dr. Anthony Youn, a US surgeon, this sound is often caused by the carotid artery pressing against your pillow.

They're from Pillowfort, Target's kids' home collection. These 12×15-inch cutesy heart-shaped twill pillows are called the Heart Reversible Mini Decorative Pillows, and they come in pink and white.