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We live in a culture obsessed with numbers: Number of steps, number of calories burned, and number of hours slept. How do sleep trackers measure sleep? How accurate are sleep trackers? A few good sleep trackers Contenu How do sleep trackers measure sleep? How accurate are sleep trackers? A few good sleep trackers Despite this interest and drive to improve our overall health, do we really understand how sleep tracking works? And are we using these trackers accurately? I sat down with Fitbit’s Dr. Conor Heneghan and Nest’s Dr. Logan Schneider to answer these questions. How do sleep trackers measure sleep? Sleep trackers come in a variety of forms: Smart beds, wearables, and even the Nest Hub’s Sleep Sensing feature. Despite this variety, most operate through a combination of similar features: An accelerometer to track movement, heart rate sensors to track heartbeats, and sometimes temperature sensors. Some wearable devices like the Fitbit are able to track each individual hear...