No matter how foul my mood, I always let out a sigh of joy when I splay myself out on my Tempur-Pedic mattress at the end of a long day. I admit $2,200 is a lot to spend on a mattress (and mine was on the lower end; queens can cost as much as $7,500 if you want one wrapped in a cashmere-silk blend). But I view it as a necessary health expense: I have never slept better, and I’m no longer jolted awake by my husband’s violent tossing and turning. What exactly is in the dense, foam-like material that cradles my body as if I’m womb-bound? Don’t know; don’t care. I just know I can’t live without it.