The Saatva Classic is our current pick for best mattress in the world, so it's no surprise it tops our best king mattress guide as well. A $300 discount drops the price of a king to $2,299.

Yes, the Nolah Luxe Alaskan King Mattress comes with a 120-night sleep trial. You can try it out during that time frame at home, and if you don't like it, you can return it for a full refund.

The California king (72-by-84 inches), which Rihanna immortalized in a ballad by the same name, came along shortly after queen (60-by-80 inches) and king mattresses (76-by-80 inches).

A king-size mattress is 16" wider than a queen, affording everyone their own section to comfortably slumber (and set up pillow forts). 3. Your bedroom feels more empty than spacious.