For cleaning

1. Because it gives you something to work on.
2. So that it will be easier to find things.
3. It gives you a chance to sort through your stuff.
4. Because afterwards you'll have more space for books.
5. It can be a creative way to exercise.
6. You'll be able to redecorate while you clean.
7. Because you might be happier after everything is cleaned.
8. While cleaning, you could finally figure out the answer to a problem you're working on.
9. You could find something that you lost.
10. Because sometimes cleaning can be relaxing.