Sleep trackers come in four basic varieties: apps that use sonic feedback via your smartphone’s microphone to track your sleep-related vitals; wearable sensors for your wrist, finger or forehead; under-mattress sensor pads; and, smart beds with built-in sleep tracking technology. Over the last couple of months, I’ve been experimenting with these various sleep-tracking solutions, and five criteria emerged as the best way to choose the best sleep tracker.
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