It always wants to ride up the sides of my bed because elastic never wants to hold it in place. When I wash and dry my sheets it inevitably spirals up in the washer and dryer so it never washes or dries properly. Then it’s a pain in the ass to try and fold neatly.
I feel like I’m failing adulthood after being bested by a bedsheet.
Fitted sheets are awful. For a start they never fit.
I use a massive flat sheet and just tuck it under the mattress. If your mattress fits in your bed frame rather than on it, use a mattress topper and tuck the sheet under that.