Visit the Select Comfort website (selectcomfort.com). Select Comfort is the maker of Sleep Number mattresses and offers a tool on its website that allows you to find your sleep number online by filling out some simple information. The website will take you through three brief pages of steps and then tell you your estimated sleep number.
Visit a Select Comfort store. By visiting a store, you can physically lie on the bed and adjust the numbers until you find the optimum level of comfort you seek. A sales representative can also help with any questions you have. Select Comfort currently has 409 stores nationwide.
Call Select Comfort toll-free at (888) 548-9512. Select Comfort has sales representatives available by phone who can determine your sleep number simply by asking you questions about your height, weight and comfort desires. If you are interested in purchasing a Sleep Number mattress, you can also do so by calling the toll-free number.