Lately I've been terribly absent-minded. Scanned my driver's license to check out a book at the library instead of my library card; picked up my mail but couldn't find the mailbox key afterward (I'd left it in the keyhole of the mailbox); I work at a sports center and a kid handed me money to swim, I rang it up and then handed his money back to him instead of putting it in the til. The list goes on and on. This started occurring pretty suddenly about two weeks ago. What is going on?