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.
Keep it from riding up by buying an extra size bigger (sheet should be 1 size bigger than bed).
Washing it with other stuff is fine, but don’t dry it with the rest of the load. Hang it to dry somewhat while drying the rest of the load (I drape ours over our dining room chairs), then once the rest of the load is done drying, dry the fitted sheet by itself.