All sorts of things can keep one awake. But as you get older - this is what the stroke thing really brought home to me - this thing that I never paid attention to: my brain. I've always been conscious that, of course, after a night of getting stoned, my head would feel foggy; if I got drunk the night before I'd be hungover. But that was the extent of my concern about my brain. And then with the stroke thing, it made me realize, "God! That's my main source of income." So it relates actually to your other question about growing old.

I always hope to come up with a style of writing that's appropriate to the material and I felt like this was. And then there's plenty of - I don't know if it's the right word but - lampooning, but it's always at my expense.

In foreign countries, when people see what Donald Trump is saying on Twitter since the election and seeing what he's saying in these calls with foreign leaders, they take everything very seriously and they take everything very literally.

To be interested in something is to be involved in what is essentially a stressful relationship with that thing, to suffer anxiety on its behalf.

If Donald Trump thinks that just by being unpredictable that somehow he can have an impact, but not necessarily commit himself to certain things, that's not the way it is going to be read in foreign capitals. Foreign governments are going to take these things very literally and very directly.

The process of book writing for me is entirely one of trial and error.

Have regrets. They are fuel. On the page they flare into desire.