Wash your bedsheets.
Take off your fitted sheet, oversheet, and pillow cases. Give them a wash, then either hang them on the line, or put them in the dryer. Make sure to do it earlier in the day, so that you have time to make your bed later tonight. Don’t sleep on the mattress until the sheets are on there, it will feel so good.
Task length: Ongoing through the day.
ALTERNATIVE: If you can’t get to this task before the evening, remake your bed instead. Pull of the sheets and put them on how you like them, rather than the slightly looser crumpled state they tend to end up in.