Narrator: Remember waterbeds? You might not, but they were all the rage in the '70s and '80s, and they kind of developed a reputation as a mattress that was good for, you know, stuff other than ...

Concurrently, dry mattress technology improved rapidly —and began outperforming waterbeds, leading to their gradual decline.

My parents tried Eight Sleep's Pod 4 for a month, and it improved their sleep cycles. The smart mattress cover has ...