"Bed risers" are furniture accessories that elevate your bed higher off the ground. They are used to create more storage space underneath the bed or to make it easier to get in and out of bed. Full definition
Use bed risers if possible, or find a sturdy piece of foam that is the same height and width of the crib mattress and place it under the crib. (howtoadult.com)
I made bed risers to raise the height of the bed so the boxes could easily slide in and out. (organizeyourstuffnow.com)
Depending on your bed situation, you might want bed risers. (businessinsider.com)