Empty brain

I've gotten some e-mails I should answer. I am just staring at them and not coming up with anything sensible to say. It is like those situations when people I don't quite know but happen to work with come and sit beside me on the bus. Emptiness.

Tomorrow will be interesting (if everything has run smoothly). But I have no expectations and no real thoughts about that either. I am wondering if I am beginning to become really tired, this indifference to everything is not like me.