Then, when you get back to work, you may find that it's easier to focus.
A messy desk might not seem like much, but visual clutter can influence mental clutter, and make it hard to focus. Take a quick five minute break to organize your desk. Throw away any papers that are no longer necessary, stack your books in a neat row, and coil any stray wires that might be lying around. Then, when you get back to work, you may find that it's easier to focus.