47- Internal Clock

  Agent 47 awoke with a jerk, eyed his wristwatch, and saw that it was 5:58 a.m.

  Waking without an alarm clock was one of the many skills he’d been required to master as a child. And the only way to avoid a blow from one of the “memory sticks” that the asylum’s staff members carried was to wake up a couple of seconds early, and clearly signal that fact.
...

  As always, Agent 47’s eyes snapped open at 5:58 a.m. He got up, took Pruter’s Glock into the bathroom, and put the DOVO to work. Twenty minutes later he was shaved, dressed, and ready for the new day.

- Hitman: Enemy Within, chapters 4 and 20