PROJECT NARRATIVE Physical and mental health can suffer due to insufficient sleep, but even getting enough sleep can be problematic when sleep is qualitatively suboptimal. Suboptimal sleep contributes in the general case to problems that include drowsiness, lethargy, muscle aches, inattention, and poor memory, and in various disease states to problems that include cardiovascular issues, anxiety, depression, and other stress-related dysfunctions. To improve health for a wide variety of patients, including but not limited to patients with obstructive sleep apnea, this project will usher in a new orientation to improving sleep with innovative methods for altering sleep physiology in the home based on easy-to-use wearable technology that changes what happens in the brain during sleep.