Once or twice a year, maybe? Seriously.

It's not as easy for me to change mine - it's SOOO much trouble putting them back on. And I don't think mine get that dirty. The animals don't sleep with me - Daisy can't get up on my bed, Jessie sleeps under my bed, Jake sleeps on my parents' bed, and the rest are in various places other than my bed. The only time I wash my sheets are when my mom says "that's gross" and rips them off. I don't think they need it, though... they're just comfy as ever! I'm the weirdo who sleeps on flannel sheets in the middle of the summer because they're too comfy.

But yeh, sorry if I grossed anyone out. Funny thing is, my mom washes her sheets just as often as me.. she just washes hers hours before mine, giving her room to call my sheets dirty. :P