Smack the handle end of the broom against the hump for five to 10 minutes to redistribute the pillow top's filling.
Change your default sleep spot. If you sleep on the right side of the bed, change to the left side to even out the mattress's pressure spots.
Rotate the mattress clockwise by 180 degrees to redistribute the points where it comes in contact with your body. The weight of your body makes impressions in the pillow top; rotating the mattress repositions where your feet, shoulders and hips rest.
Replace the pillow-top insert if possible. Some mattresses have a removable pillow top cover that unzips for easy cleaning.