If you wash and dry your sheets more than a few times, all of the loose fibers will come out. After that, any dust you inhale is supposed to get caught in your

If you wash and dry your sheets more than a few times, all of the loose fibers will come out. After that, any dust you inhale is supposed to get caught in your mucus. That's the whole point. Cotton is absolutely innocuous, even if you did inhale it. It's not asbestos, stop worrying.