Data is abundant with the rise of smartphones and other technologies at our fingertips. It even extends beyond our waking hours with sleep trackers that can offer overnight heart rate, blood oxygenation, and restlessness metrics. While we still don’t understand everything sleep does for our bodies—or why we dream, for example—nowadays we can use fitness trackers to follow, and maybe even improve our nightly sleep.
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Sleep Trackers use accelerometers, which measure acceleration. For instance, Fitbit and Garmin, and Whoop use “three axis accelerometers” to measure movement along three planes. One is parallel to the device’s screen and runs left to right, another parallel plane runs from the top to bottom, and the third is perpendicular to the device’s screen and points upward. Apple Watch also relies on at least one accelerometer, though I couldn’t find specifics on the configuration of axes. Even the most scaled-back Fitbits, like the Fitbit Flex—an early model that was discontinued—rely upon three-axis accelerometers to follow movement as you sleep.
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Wearing one while sleeping can be a personal choice for every person. While some are used to it, others find it a tad too uncomfortable. The light behind the watch or the strap can sometimes lead to a disturbed sleep cycle. If you fall in this category then it is not advisable to wear a smartwatch as it can lead to a disturbed sleep cycle.
Some people are also concerned about the radiation that a smartwatch emits, which is also said to be radiated by smartphones, laptops, TVs; basically, most electronic devices. A smartwatch emits Electromagnetic Fields (EMF), which is low-frequency, non-ionizing, and does not have enough energy. A smartwatch usually sends signals in small bursts for a very short period of time. So, the radiation levels from a smartwatch are almost minimal! So, keeping your comfort in mind, you can wear a smartwatch 24*7. So, keep your hand with the smartwatch away from your head and you are good to wear it, even while sleeping.
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