Ask yourself, "What do I most want to improve?" Then seek a tool to help you do it.
By Catherine Price
Photo: Courtesy of Zeo
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My favorite feature of the Zeo (the sleep-tracking device) was its alarm: Whereas a traditional alarm sometimes jolts you from a deep sleep (which can leave you groggy), the Zeo beeps at a "natural awakening point" when you're transitioning in or out of REM.