A simple permanent solution would be to scribe the legs to the floor.
How to level a bed on an uneven floor.
For example if you are trying to level a chair on a sloped floor slip a book of matches or a wooden shim under the leg that isn t reaching the ground.
If necessary stack two and place under the feet that need more height.
When you are dealing with uneven floors one option that you have is to use self leveling compound.
Are the beds legs uneven even if it s on a level surface.
Self leveling compound is similar to concrete typically coming in large bags in powder form.
Lock that spread on the compass.
Use a trowel with a 1 4 to 1 2 inch.
Cut it to an appropriate size and slid it under each foot that needed adjusting.
If the floor is uneven lift up the board until it is level so you ll know how much flooring compound you ll need to even it out.
If the surface is only mildly uneven and is only producing mild lipping at the corners of the tiles beating the tiles into the mortar bed can reduce the issue.
You will have to make sure your joists can handle the addition of considerably more weight from the plywood subfloor and any floor coverings.
All you have to do is drill a hole.
Place a thin angled item under the short leg or side of the furniture.
If the uneven floor is due to floor joists that have warped or twisted over time or were incorrectly installed the only way to level the floor is to remove the subflooring and shim the joists.
On the top side of the floor another fix it idea to lay down new hardwood over the existing floor.
If you own a compass the kind for drawing circles not the kind that points to magnetic north set it at a spread that s as wide as the widest gap between floor and bottom of leg.
A plywood subfloor will bridge any minor waves in the existing floor and leveling compound would help too.
These particular levelers have a long shank so they should be able to keep things level even on the wobbliest floor.
Floors are rarely perfectly level.
They adjust the bed height with pressure of your body.