It was not an unfamiliar sensation, but it was strange to feel it in the daytime. Mostly, it was a nighttime visitor, an ever-gentle gnawing at the b… - David Gerrold

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It was not an unfamiliar sensation, but it was strange to feel it in the daytime. Mostly, it was a nighttime visitor, an ever-gentle gnawing at the back of the head that had to be always guarded against, lest its realization sweep forth with a cold familiar rush. It was the sudden startling glimpse over the edge—the realization that death is inevitable, that it happens to everyone, that it would happen to me too; that someday, someday, the all-important I (the center of the whole thing) would cease to exist. Would stop. Would end. Would no longer be. Nothing. Nobody. Finished. Death.