We've listed our favorite Prime Day mattress deals that someone on our staff has tested themselves and personally vouched for. Keep an eye on all the Prime Day sales going on, as we are doing lots of live coverage to keep you informed. For more on WIRED's sleep coverage, check out our guides to the Best Mattresses, Best Organic Mattresses, Best Mattress Toppers, and Best Sheets. ), it's running an onsite Dream Day Sale until the end of Prime Day. Best Prime Day Bedding DealsA Beloved PillowAfter testing nearly 30 different pillows, our testers still can't stop raving about Coop's pillows.