The most efficient way to purchase a mattress is in person. It is important that you test out the mattress. Consumer reports show that you should lay on a mattress for at least 15 minutes in your favorite sleeping position. Testers have found that after laying on their favorite mattress for at least 15 minutes was often the same one they liked after a month. - Consider your mattress an investment. Don't always buy based on price. You may be tempted to purchase a lower priced mattress, it's important to buy a mattress based on your ideal comfort level.