In Mark's Gospel, the last words that Jesus speaks to his disciples are, "Are you still sleeping and taking your rest? Enough! The hour has come; the Son of Man is betrayed into the hands of sinners. Get up, let us be going. See, my betrayer is at hand" (14:41-42).
When I was an accounting professor, I would warn my students that the persons likely to embezzle would be trusted employees--after all, they would be the ones most likely to have access.
This phenomenon is not new. Read Zechariah 13:1-7.
The men that Jesus chose as guards were three of his closest associates. They went to the sleep on the job. The one who sold him out to the Romans was also one of the twelve.
The work of the resurrected Christ continues. Who's sleeping on the job? Who is betraying the message?