Wearables like smartwatches and activity trackers have plenty of uses when it comes to fitness and health tracking. They’re full of sensors that can monitor a variety of readings and metrics, and they can interpret and present a multitude of data sets based around those readings. There are plenty of reasons to wear a smartwatch throughout the day, but the thing is, they can also be handy to keep when you go to bed.  Many of those sensors can
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