Sleep Tracker by Eight Sleep
If the Aura is the Mercedes-Benz of sleep trackers, think of the Eight as a Rolls-Royce. Yes, it costs a whopping $400, but you’re also getting an electric mattress topper that can warm each side separately, which is perfect if your significant other prefers the bed a little warmer than you do. The Eight can actually track sleep for two people (with two independent sleep cycle alarms) and does not require anything to be worn while sleeping. Eight promises that the ballistocardiography sensors built into the mattress topper tracks body movement and breathing rate to proivde the most accurate sleep tracking available. We would hope so, considering the investment involved. ($399.99, www.eightsleep.com, App available on Android/iOS)
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