Matthew 26:45 - Ellicott's Commentary On The Whole Bible

Sleep on now, and take your rest. — There is an obvious difficulty in these words, followed as they are so immediately by the “Rise, let us be going,” of the next verse. We might, at first, be inclined to see in them a shade of implied reproach. “Sleep on now, if sleep under such conditions is possible; make the most of the short interval that remains before the hour of the betrayal comes.” Something of this kind seems obviously implied, but the sudden change is, perhaps, best explained by the supposition that it was not till after these words had been spoken that the Traitor and his companions were seen actually approaching, and that it was this that led to the words seemingly so different in their purport, bidding the slumberers to rouse themselves from sleep. The past, which, as far as their trial went, might have been given to sleep, was over. A new crisis had come calling for action.