Advice varies on how frequently you should wash your sheets if you have a cat that sleeps with you, but most people advise that you should wash bedding every 1-2 weeks without a cat, and arguably more frequently if you do have a pet that sleeps on the bed with you. Some people suggest washing bedding every 3-4 days if that’s realistic. Be careful to use gentle detergents whenever you wash bedding that your kitty sleeps on, and if you notice their behavior changing when you have changed the detergent you’re using, be aware that this might be a sign of an allergy in your cat.