After reading "How to Keep House While Drowning" I decided that it is nuts to fuss over things like folding sheets when you're struggling with summoning the motivation to do life in general. So now every time I wash my sheets I put the clean flat sheet, fitted sheet and three pillowcases inside the fourth pillowcase. Everything is kept together. Sheets are wrinkled after the first night theyte on the bed so it doesn't bother me in the slightest to shove them in there.