Many of today's top-quality mattresses use technologically advanced foams and fibers that are designed to be softer and more comfortable while ensuring your body has the support you need for good health. By cradling your body, these materials relieve pressure and are so comfortable that you'll probably toss and turn less in the night. For that reason, in the first few weeks you sleep on a new mattress that offers these extra comfort layers, you will likely notice some body impressions on the mattress surface. These impressions are normal and shouldn't be considered a sign that something is wrong with your new mattress. Unless your mattress care instructions indicate otherwise, you may want to rotate your mattress from end-to-end and from top-to-bottom. After a few weeks, the impressions will begin to smooth out and, over time, disappear.