8/10 across the Tempur-ActiveBreeze smart bed at the Tempur-Pedic factory and research facility in Trinity, North Carolina. I was on a media tour learning about mattress tech, and during a quick break in one of the brand's showrooms, our guide pointed out the Tempur-ActiveBreeze smart bed. It looked just like the other beds around it, except that a slight chill emanated from its surface. I would have just passed it off as AC running on high in the room, but a bedsheet pinned to the bed's surface started floating upward. Our guide explained that the mattress had internal air channels connected to fans in the base that blew air toward the surface. At first, this concept broke my brain a little—fans in the base? I'm familiar with similar cooling tech, such as the BedJet 3 Climate System, that provides temperature control by blowing air across the mattress's surface, but the ActiveBreeze blows the air from inside.…