When do you change your bedding?

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I just recently changed my linens after feeling a bit itchy one night. It was only then that I realized how long I haven't changed my bedding! I used to do it twice a month or every other week, but it began raining a lot so it longer for the laundry to dry. I guess I got itchy because it's been over a month since I last remembered to change my sheets! What about you? How often do you change your bedding? Do you do it because it's already a habit or because you feel the sheets are already dirty?