Michael A. Grandner is a licensed clinical psychologist board-certified in Behavioral Sleep Medicine, director of the Sleep and Health Research Program at the University of Arizona College of Medicine—Tucson, director of the Behavioral Sleep Medicine Clinic at the Banner-University Medical Center in Tucson, AZ, and associate professor of Psychiatry, Medicine, Psychology, Nutritional Sciences, and Clinical and Translational Science. He has worked with sleep wearable technology for over 20 years and has extensive experience with these devices in research and in clinic. Kathryn E.R. Kennedy is a member of the Sleep and Health Research Program at the University of Arizona College of Medicine—Tucson. She is interested in sleep wearable technologies used to measure and intervene with sleep, as well as other novel therapeutics. She has a background in basic laboratory science and has transitioned into a career focused on translational approaches linking sleep, health, and behavior. She is currently completing her Ph.D. as part of the Graduate Interdisciplinary Program in Physiology at the University of Arizona College of Medicine—Tucson.

• 1. Introduction.- 2. Rationale,- 3. History.- 4. Movement Sensors.- 5. Heart Rate Sensors.- 6. Other Sensors.- 7. Algorithms.- 8. Performance and Accuracy.- 9. How to Choose a Device.- 10. Current Devices.- 11. Device Management.- 12. Scoring and Interpretation.- 13. Skepticism and Limitations.- 14. Across the Lifespan.- 15. Use In Sleep Disorders.- 16. Use in Special Populations.- 17. Beyond Sleep-Wake Assessment.- 18. Future Directions.- 19. Resources and Further Reading.