Worlds of the Imperium by Keith Laumer

There was a scratching sound which irritated me. I tried unsuccessfully to weave it into a couple of dreams before my subconscious gave up. I was lying on my back, eyes closed. I couldn't think where I was. I remembered a frightening dream about being followed, and then as I became aware of pain in my shoulder and head, my eyes snapped open. I was lying on a cot at the side of a small office; the scratching came from the desk where a dapper man in a white uniform sat writing. There was a humming sound and a feeling of motion.

I sat up. At once the man behind the desk looked up, rose, and walked over to me. He drew up a chair and sat down.