"I used to wash my sheets whenever I remembered, which could mean anything from one week to let's not talk about it. Adult life is basically discovering that everything needs cleaning constantly." —SpecialistYear9917"I wash my sheets every weekend, and the pillow cases are swapped out mid-week (I use two sets and then wash them with the sheets), even if I manage to shower before bed. My allergy symptoms were pretty much eliminated when I started swapping the pillow cases more than once a week." —purple_hamster66