I'm up at 5:30 or 6, but not willingly. By 8:30, I'm in my home office. I take a swim in the afternoon, and I garden. We have about an acre of land.
A few years ago, I actually did come up with a mocking sort of epitaph for myself. It's this: 'Here lies Robert Silverberg. He spent most of his life in the future. Now he's in the past.'
I can list on one hand the famous science fiction writers I never met.
