Enter the Sleep Number x12, a smart bed that monitors your sleep habits over time and can even stop your partner from snoring. The x12, which Toms Guide had a chance to try at CES 2014, starts at $8,000 and ranges up to $15,400, depending on the size and upholstery you prefer. The bed provides all the expected features of a Sleep Number bed, a brand known for its adjustability and ability to accommodate two partners with different sleep preferences.