We’re going to outline a number of solutions when you need to know how to fix mattress indentation, since there are different solutions based on the root cause.
A Sagging Coil / Spring Mattress
A sagging mattress may occur because the top mattress doesn’t have enough support. This is actually the easiest type of mattress indentation to fix. You may need to move the slats under the box spring mattress around to support the low areas. Or you may need to add more slats to support the load. Some people solve the issue with a metal mattress helper, while others put whole boards under the mattress so that the mattress can’t sag.
If the mattress coils are compressed or weak, you could end up feeling that layer of hardness after you sink into the mattress at night. If this happens, you really need a new mattress.
Body Indentations in a Coil Mattress
If you have a two sided mattress, you can eliminate the body indentations by flipping over the mattress. If you don’t have a two sided mattress, you can try to solve the issue by rotating the mattress. Then your body is no longer putting pressure on the weak area. It may or may not rise back up, but you’re not making the matter worse. Flipping your bed once or twice a year or rotating it every few months helps to prevent indentations from forming in the mattress in the first place.
A temporary solution if it isn’t due to insufficient support is putting pillows beneath the sagging areas. However, this shouldn’t be done for too long. Another short term solution is putting a mattress topper on a sagging box spring. A memory foam mattress topper is an option if you have a very lumpy bed surface or a deep depression. If you still can’t rest well at night, replace the mattress and put the mattress topper on your new bed. A mattress pad will cover up a minor indentation but won’t prevent it from eventually getting worse.
A long term solution could be replacing damaged or compressed springs in the mattress, though it can be easier to replace the entire bed.
Body Indentations in a Pillow Top Mattress
Indentations in a pillow-top mattress or pillow mattress (like goose feathers) is rather easy to solve. Try to redistribute the stuffing by manually pushing it into the low spot. If necessary, use a vacuum to try to pull the stuffing back into position, assuming you can’t accidentally suck up the stuffing itself.
What if this doesn’t work? In some cases, you need to replace the indented pillow top layer because it cannot be made smooth. If the mattress under the pillow-top is indented, you can try turning the bed, or you may need to replace the bed. If the foam layers are indented because the foam is aging or excessively worn down, you can’t fix it – only replace it.
Body Indentations in Memory Foam Mattresses
Memory foam mattresses may have indentations formed by the sleeper each night that go away during the day. You can reduce the issue by improving air flow around the bed and between the layers of foam. Reducing heat retention by not sleeping under as many layers may be a solution, depending on what is comfortable for you.
In some cases, the memory foam mattress is unable to breathe because it is on top of a box spring; switching to a bed frame with open air flow underneath may reduce heat retention and the resulting indentations in the memory foam. Conversely, if you’re sleeping on a foam mattress on the floor, get it up – it can’t breathe where it is.