As you fall asleep, your brain becomes more internally synchronized, allowing less information to be processed. Although researchers have learned that volunteers in sleep labs do recall having some sort of conscious experience most of the time when awakened from NREM sleep, the quality of these experiences seem to differ from the vivid dreams of REM sleep. Sleep can be broadly divided into rapid eye movement (REM) sleep, when a person is most likely to be dreaming, and non-REM (NREM) sleep, when a person is more likely to be in a dreamless sleep. Next, we need to understand the different stages of sleep. The Fitbit Versa also features an SpO2 sensor for measuring blood oxygenation, but Fitbit is not yet using this feature to tell you about your sleep (more on this later). PPG measures blood flow based on how green light from an LED on the back of the watch is reflected by the body.īasically, Fitbit looks at how much you’re moving and how often your heart is beating to infer whether you’re awake, in a deep sleep, a light slumber, or dreaming.
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To learn about how Fitbit can monitor my sleep, I tracked my nightly slumbering with a Fitbit Versa watch for two months. (Full disclosure: I received this product free of charge from Fitbit to review.)įirst, how does a Fitbit watch monitor sleep? The Fitbit Versa infers when you’re sleeping and what stage of sleep you’re in using an accelerometer (an instrument for measuring bodily accelerations of the wrist) coupled with a technique called optical photoplethysmography, or PPG. As I’ve discussed in previous posts, sleep is essential for draining the brain of toxins linked to Alzheimer’s disease and for consolidating memories from the previous day. Getting a sufficient quantity and quality of sleep is not only a core component of health, but often an underappreciated one. But one of the smart watch’s most useful features is arguably what it monitors while you’re burning the fewest calories: your sleep. When you hear the word “Fitbit,” you probably think about logging steps, calories, and cardio. If someone had told me a year ago that he sleeps with his watch on at night, I’d probably wonder just how eccentric of a personality I was dealing with.
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