Tempurpedic owners: do your fitted sheets slip?

I own a Tempurpedic Celebritybed, which is the one with the extra pillow-top on it, and I have noticed that no matter how deep of a fitted sheet I put on it, the sheet comes off one corner every night. No matter what I do, the sheet comes undone, but only on that one corner, and only in one direction. I heard it has something to do with the cashmere top and the direction of the fabric, but how do I stop this from happening? It makes it a pain in the butt to make the bed every morning.


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