Albert Barnes Commentary Mark 14:41

"And he cometh the third time, and saith unto them, Sleep on now, and take your rest: it is enough; the hour is come; behold, the Son of man is betrayed into the hands of sinners." — Mark 14:41 (ASV)

It is enough. There has been much difficulty in determining the meaning of this phrase. Campbell translates it, "All is over;" i.e., the time when you could have been of service to me has gone by. They might have aided him by watching for him when they were sleeping; but now the time was past, and he was already, as it were, in the hands of his enemies.

It is not improbable, however, that after his agony some time elapsed before Judas came. He had required them to watch, i.e., to keep awake, during that season of agony. After that, they might have been allowed to sleep while Jesus watched alone. As he saw Judas approach, he probably roused them, saying, It is sufficient—as much repose has been taken as is allowable—the enemy is near, and the Son of man is about to be betrayed.