I have a very healthy relationship to my work, and I find that if a scene is working, no matter how intense it is, you have the catharsis on screen, and you can let it go. I think it's, if at the end of the day you feel like you haven't cracked it, that's when you go home and it's more difficult to switch off.
I think the height of ridiculousness was when I was playing Elizabeth in 'The Golden Age' while preparing to start shooting 'I'm Not There.' I literally finished filming Elizabethan grandeur on Friday, flew to Montreal, and started being Bob Dylan on Monday.
I talk to my fan club members, and I blog, and they know what's going on. But as far as Twitter, I'll be in a restaurant, and I'll get home, and somebody tweeted, and they talked about what I ordered and what I was wearing. In some cases, that could be dangerous, because you don't want everybody to know where you are every second of every day.