How to Fix a Sagging Memory Foam Mattress

After sleeping on mattress for a couple of years, especially on a memory foam mattress, you may notice it losing shape, support and responsiveness, causing you to sink too much into it and feel enveloped by it.

If you take a better look at the mattress, you may notice indentations that won’t only make your sleep extremely comfortable but can also compromise your health and cause back and hip pain, stiff spine and other problems.

Slight indentations that you see right after you get out of the bed are normal, even with high quality mattresses as memory foam has a slow response to pressure and needs some time to spring back to its original shape. But, if there are any lasting indentations, they may indicate sagging.

So what should you do when your mattress begins to sag in places? Should you try to fix it or buy the new one?

Well, this depends on how bad the situation is. If sagging is not so extreme or you are just not yet ready to buy a new mattress, then you will do well with a temporary fix until you can get a new bed.

In this article, we will give you a few tips on how to fix a sagging memory foam mattress, but before we get to these tips, let’s talk about what causes sagging. Last updated Apr 29, 2020 @ 8:19 pm

What Can Cause Sagging

There are several reasons why a memory foam mattress may sag in places, and although you can’t completely stop sagging, you can try to fix the mattress a little and prolong its lifespan.

Poor Care

If you do not maintain your memory foam mattress properly, it may wear out faster. 

You should clean it regularly as the prolonged accumulation of dead skin cells and sleeping on them and other tiny debris can grind them into your mattress and eventually damage the structure of materials used in its construction and lead to sagging.

In addition, exposure to moisture can also lead to sagging and impact your health too.

Frequent Use and Too Much Pressure

Sleeping on your mattress every night also causes it to wear out and if you are a heavier sleeper and you share a bed with a partner, it will only speed up the process and cause sagging.

The Quality of a Mattress

Thicker, high quality memory foam mattresses will provide excellent support and distribute your weight evenly much longer than thinner 10” memory foam mattresses of a poor quality.

Thinner mattresses have poor support cores and less material to hold them together which is why they tend to lose support faster than thicker and durable memory foam mattresses that use high-density foams in their construction.

Wrong Foundation

Placing your mattress on a wrong foundation with slats greater than 3 inches apart can cause it to dip between the slats, damage the foam and lead to sagging.

Box springs are also a bad choice for memory foam mattresses as they usually don’t have the support needed for memory foam mattresses.

How to Prevent the Sagging of a Memory Foam Mattress

All memory foam mattresses will eventually wear out and begin to sag, but if you care for your mattress properly right from the time you buy it and keep it in excellent condition, you can prevent premature sagging and prolong its lifespan.

So, what should you do?

  • Avoid eating and drinking in a bed – You should avoid eating and drinking in a bed as this could lead to accidental spills which can damage the structure of the materials used in your mattress.
  • Use a mattress protector – Using a mattress protector will protect it from moisture and will prevent the dirt and dust from getting into it.
  • Avoid sleeping in the same spot every night – Sleeping in the same spot and the same position every night can cause that area of your mattress to lose support faster than other areas.
  • Rotate your mattress – Rotating a mattress on a regular basis (at least once every 2-3 months) will even out the wear and prolong its lifespan.
  • Clean your mattress regularly – You should clean your mattress regularly as well to prevent the accumulation of dust, dust mites, dead skin cells and other debris.
  • Buy a mattress with a good warranty – Mattress companies offer warranties to protect a customer from a sagging mattress. However you should keep in mind that warranties cover only structural defects, and not damage caused by mishandling and misuse. Also, most companies won’t repair or replace a mattress unless the indentations are more than one inch thick. So, pay attention to whether the mattress you want to buy comes with a warranty that covers sagging under one inch.

How to Fix a Sagging Memory Foam Mattress

Here are several ways how to fix your saggy memory foam mattress:

Use a Pillow

If your mattress has a depression in your hip area, let’s say somewhere in the middle, you can use a pillow to fix this. What you will need is a soft fiber pillow. Place it beneath the saggy area and this will even out the surface of your mattress and improve support where your mattress lacks it.

If there are more indentations, you can use more pillows. Avoid using too firm and too large pillows as they can make bumps on your mattress and make your sleep uncomfortable.

Use a Mattress Topper

To fix a sagging mattress, you can also use a mattress topper. Go for a thicker mattress topper that will even out the surface of your bed and make your sleep more comfortable.

A mattress topper can reduce the amount of heat that gets to your mattress which can further firm up the memory foam or slow down its softening over the night and increase the amount of support you are getting from your mattress.

Use a Plywood

If your mattress is sagging slightly and if it’s not getting the proper support from the bed foundation or a box spring, you can fix this by using a plywood.

Place a plywood underneath your mattress, between it and your foundation, and it will provide a better support for your mattress. Although it may not completely fix the issue, it can help at least a little. If you feel it needs even more support, you can double up on the plywood.


So, if you are sleeping on a saggy mattress that causes you to wake up feeling tired and in pain, you should do something to fix the problem or buy a new mattress.

In this article we gave a few simple tips on how to fix a sagging memory foam mattress which can prolong the lifespan of your mattress, allow you to sleep more comfortably and help you save some money.

We hope, they will be helpful to you and that they will also help you improve the quality of your sleep.

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