I like “zip sheets”. Expensive but great for an adjustable bed. Bottom sheet is composed of two pieces. The base has really strong elastic and covers the side of the mattress that your body does not touch. The top piece is a flat rectangle that zips with a covered zipper to the bottom section. You seldom wash the side base and the portion that you sleep on just unzips and only covers the top of the mattress. You don’t have to lift and tuck corners after the initial installation. No matter how you adjust the bed, the sheet never slips off the corner. YouTube has some videos to watch.
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