I often compared my previous mattress to a cloud. The older version of Casper’s high-end Wave model, which I bought in 2018, featured five layers of foam and no springs, giving me cozy nights of sleep—even though I’m usually a light sleeper. But as I’ve gotten older and developed some muscle tension from sports, I wanted to try a mattress with a little more support. So I was thrilled to put the Casper Atlas Hybrid Mattress to the test (the company provided a free mattress for this review).