Not My Watch

Assignment: Craft a short story from the following prompt;
“Matt glanced at his wrist. It was exactly 3:15, but this was not his watch.”

One result:

Matt awoke with a start. Something was making a racket topside. Starboard. He thought about getting up to investigate… (Matt glanced at his wrist. It was exactly 3:15.) but this was not his watch. So he turned over in his berth and went back to sleep.