The most terrifying thing I can think of is being alone - and I mean utterly alone, like no one else in the world alone - at night. That's the nucleus of the first story in my collection and it's also where the title came from for the book.
“It was a long time in the making, my divorce. One day became less special than the next, and pretty soon, we ceased all conversation. It is a sad day when you have nothing left to say.”