The disciples went to sleep when they should have kept awake, and when they realized what they had done it produced despair.  Never let the sense of failure corrupt your new action.

From Matthew 26:45-46:  “Then He returned to the disciples and said to them, ‘Are you still sleeping and resting?  Look, the hour has come, and the Son of Man is delivered into the hands of sinners.  Rise!  Let us go!  Here comes my betrayer!'”