Should i do anything about my sheets/bedding if during the night i couldve touched my butt then touched the sheets?

No changes should be needed. Cleanliness is each person's everyday goal, but people should not overdo things; meaning not overwash themselves nor overworry about germs. It's assumed that all persons touch themselves and are generally fine. Thus, sheet-washing can stay on it's regular schedule regardless of the butt-touching, face-touching, penis-touching, vagina-touching, etc., going on.