Summoning all my willpower, I ease myself from my lover's arms and slide out of bed. I pick up my discarded underwear and scoop up my dress from the living-room rug.

I've unboxed 12 of the things. Hybrids are the heaviest type of mattress thanks to more materials, but as many of the best hybrid mattresses of the year now come shipped in a box, unboxing is a ...