Mattress friction question

[charlie10]

Hi

 

At university my mattress bed keeps slipping off the bed when I sleep on it. I'm trying to find something that would offer friction against the mattress and the metal bed, when placed in between the two. I've tried a rug and that helped but wasn't 100% effective, i'm now using a cotton bath mat and that doesn't work as well as the rug. Will a yoga mat or a PVC mat offer more friction? If not what material will?

 

Many thanks

 

Charlie