Sleep Trackers and Sleep Monitoring: How Wearables Measure Sleep Stages, Limitations, and Clinical Meaning
Sleep trackers are consumer and clinical tools that attempt to quantify sleep timing, continuity, and architecture (e.g., presumed sleep stages) using physiological signals such as accelerometry, photoplethysmography (PPG), and sometimes skin temperature or electrodermal activity. Although they can improve awareness of habits and support behavioral change, they rarely replace clinical sleep assessment. The key clinical… Read More »