The first thing I do every morning is take my phone, wedged carefully beneath my pillow, and check my sleep stats. They’re tracked, in a weirdly calming graph of blue-blacks, within an app called Sleep Cycle, where I’ve used them to feel very, very good about the sleep habits of a thirtysomething, childless journalist. Sometimes I take screenshots of my stats, hovering so self-righteously over eight hours a night, and send them to friends; earlier this fall, I Instagrammed a particularly impressive 10 hours, the result of a solid dose of strep throat medication. January 1, 2015.