I tried Eight Sleep Pod 5, the smart mattress cover that promises to improve my sleep CNET Managing Editor Nasha Addarich Martnez will be testing Eight Sleeps temperature controlled sleep system, the Pod 5 Core, over the course of the next few weeks. Unbox this $3,000 smart mattress Eight Sleep launches new Pod 5 Ultra a world first fully immersive sleep system Tom's Guide Pod 5 Spotlight: Unlocking surround sound with the new Base