The human body needs sleep as much as it needs food and water. Yet many people fail to get enough, causing both mind and body to suffer. People who struggle for shuteye could benefit from monitoring their sleep, but they have limited options for doing so. In a new study in ACS Applied Materials & Interfaces, one team describes a potential solution: a self-powering smart pillow that tracks the position of the head. Studies have linked chronic lack of sleep to physical ailments, such as dia...