Ten Mattress Care Tips It is normal to experience an adjustment period after switching to a new mattress, especially if you had been sleeping on your last mattress for a long time. You should allow up to 1 week for your body to adjust to a new level of comfort and support. Remember that mattress foams and fibers will be subjected to normal wear over time. To reduce normal wear, you can rotate your mattress as needed. Buy a matching box spring (also referred to as a foundation