They make elastic straps with spring clips(alligator clips?) that go under the mattress and clips to the sheet to hold it taut. They are kind of like the old fashioned garter belt. As we get older, making a bed with fitted corners becomes very cumbersome and exhausting. And if they are not fitted properly, they tend to spring loose when one is sleeping and become rumpled under the sleeping individual. I empathize with the OP.
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