Sleep tracking – along with a new TicSleep app – is coming to the TicWatch Pro and TicWatch Pro 4G/LTE. 

Mobvoi – the company behind TicWatch – touts a range of features for the new functionality. Proactive Sleep Tracking, Sleep Cycle Tracking and Sleep data history are just some of the features.
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https://www.trustedreviews.com/news/ticwatch-pro-sleep-tracking-arrives-and-its-about-time-3949142