While I waited for my mattresses to be delivered, I hit some mattress stores. Aside from variations in size and upholstery, all mattresses look alike. Are they?Let’s start with the basic types: innerspring coil, foam, hybrid (foam and innerspring), and adjustable air. Within each category are subcategories. There seem to be more kinds of foam mattresses than there are craft beers from Brooklyn, but don’t be fooled by proprietary terms like “Ambien-injected kosher crypto-foam.” There are actually only two types of foam: polyurethane, of which memory foam is a subset, and latex.You’re just getting started making decisions, however. What level of firmness do you like? Do you sleep on your side, back, or stomach? When your bedmate tosses and turns, how much does it disturb you (on the Richter scale)? Do you want your mattress all-natural, or will a soupçon of nature do? Do any of the following materials alarm you: soy, hemp, horsehair, mohair, coconut fibre, green tea, polylactide derived from sugarcane? Are you for or against heat-conductive copper flecks? Is the amount of “edge support” that your mattress provides a matter of life and death? How much extra are you willing to pay for latex foam that is flash-frozen before it is baked, or will mere baking suffice?“Which mattress should I get?” I asked Alex, a Saatva “sleep guide” who works in the company’s New York showroom. “It depends on your palate,” he said, like a waiter who’d been asked whether he recommends the chicken piccata or the trout amandine. Saatva is an e-commerce company, the parent of Loom & Leaf and Zenhaven, two other big names in direct-to-consumer bedding. Merchandise in the showroom is available for experiencing but not for purchasing. The lighting is subdued, the color scheme neutral; here and there, beige artificial trees are not growing. I surveyed the thirteen beds positioned throughout the space. Of the mattresses you can buy online, Saatva was named by Good Housekeeping “Best Overall.” ($1,695. Note: All prices here are for a queen, which is what forty-seven per cent of Americans sleep on.)