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fitness trackers not only count our steps and calories burned many provide sleep stats but can you trust that data we asked an expert at the Stanford center for sleep sciences reason why these devices are good is because it puts greater emphasis on sleep most adults in the US are actually somewhat sleep-deprived but are they accurate the devices offer relatively little data as compared to the gold standard for measuring sleep polysomnography polysomnography is a collection of different physiologic measures that we use to define and characterize sleep we start with EEG which are little electrical wires that measure your brain waves and it doesn't stop there prepping a patient for polysomnography takes close to an hour it also includes measures like a snore mic that we in your neck inside your nose and over your nose in your mouth to kind of record your breathing belts around your chest a