Seemingly every holiday brings mattress sales—now including Amazon's big day. Here are the best Prime Day mattress deals we've found on beds we've tested.

Now through Wednesday, July 17, the Casper sale is offering up to 30% off everything — including mattresses , bedding, bundles, furniture and more. Prime Day is typically one of the best times of year to shop for larger purchases like a new mattress, so don't sleep on these savings.

This Nectar mattress is a whopping 46% off, saving you an unheard of $550 this Prime Day. It has cooling memory foam gel comfort, a year long sleep trial, five layers of mattress material, and a pillow top. Its softness rating is 4 out of 5 stars and almost 4 stars for sleep quality and comfort.