Sealy is a mattress brand that is tried and true for many people, given that it has been around since 1881. That’s a lot of time to refine your product. Sealy has kept pace with the times by offering modern variations like memory foam and hybrid mattresses while also maintaining a strong lineup of traditional innerspring beds. For example, the Cocoon Chill by Sealy is one of our favorite cooling mattresses that passed our week of testing with flying colors. While I’ve only been in the mattress industry for five years (a blip compared to Sealy’s timeline), I’m the resident sleep writer, reviewer, and certified sleep science coach here at WIRED. These are beds to keep an eye on, especially when they go on sale. Without further ado, here are some Sealy promo codes for this very case. But if Sealy isn’t the only brand you’re contemplating, you can find our top-tested picks on our best mattresses list, plus the best bedsheets to go with them.…