CES is a ruthless grind. As the largest tech convention in the world wraps up today in Las Vegas, thousands of attendees are engaged in one last push to make the most of a hectic week filled with problematic product launches, power outages, and too many sales pitches to count -- and they're dead tired. The cracks started to show Wednesday, technically only the convention's second day. Mixed in among the drone-racing courses, home robots, and at least one promise of free beer (only while supplies last!), were an untold number of people from around the world just trying to catch a goddamn minute of sleep. From nodding off at booths, to head-in-lap moments of presumed peace, to just saying "screw it" and laying on the floor, it was abundantly clear that the biggest trend at CES was sleeping through CES.