Although the best mattresses feel as soft as clouds, the worst mattresses are clouds that send sleepers plummeting back to Earth. Rest on firmer billows with today's Groupon: for $50, you get $200 toward mattress sets at Sit 'n Sleep. Choose from 27 locations.

Sit 'n Sleep stuffs its showroom with brand-name mattresses such as Sealy, Sherwood, and Simmons in a variety of sizes and firmness, from twin to California king and Euro tops to ultra plush. Sleepers slumber effortlessly atop the plush Sherwood Fremont pillow top, designed exclusively with sustainable, organic fibers and powers of clairvoyance ($399.99 for queen). Avoid tossing and turning on the Sealy Balboa Island's firm layers, replete with patented posturepedic technology stoutly supporting finicky spines throughout the night ($859.99 for full). The half-bed, half-machine Simmons Kings Cove, imbued with hybrid spring technology, struggles with its identity while its BeautySleep memory foam cuddles bodies for maximum sheep-counting.

Sit 'n Sleep's friendly mattress experts draw upon years of experience and in-store diagnostics to fit each person to his or her perfect bed. As a result of raising a mattress and then setting it free into the wild and visiting the factories of many major manufacturers, Sit 'n Sleep staff is prepared to be completely objective when helping select slumber sets.