I'm stunned by how many people wash their sheets more than once a week! My mother was Miss Perfect, and sheets got changed every week, and my brain tells me they need to be done so. However, i don't like doing it, so I maybe do it 2-3 times a month. I've been looking at the sheets every day for a week thinking "I should wash them." I like the notion of clean sheets, I'm just not that into using that much water, energy, etc to have them that frequently.
We cosleep, so there are accidents, and they get changed if they are messy. BUT, my solution to not washing EVERY THING EVERY TIME is that I have hospital style washable pads that I sleep on on top of my sheets, protection if my baby sweats, pees, pukes, etc - I change that every couple days. And under the sheets, are plastic shower curtains so I don't have to wash the mattress pad very frequently - maybe once a season?
Also, I'm downsizing, so I'd really prefer to only have one set of sheets for my bed - if I change them frequently, then that means stripping, washing, drying, and remaking the bed all in one day, and that is physically draining! The kids will probably always have 2 sets of sheets, though.
--janis