Note 8 at Mr 14:41: Jesus' statement to His disciples to "sleep on now, and take your rest" was not speaking of physical sleep, as can be seen by His statement to them in Mr 14:42 to "rise up, let us go." He would not have told them to keep on sleeping and then wake them up.

Besides physically, the disciples had also been asleep spiritually; i.e., they had not been watching with Jesus in prayer as He had commanded them to (Mr 14:34). Jesus, in sorrow, acknowledged their failure and prophetically spoke of this condition continuing with His words "Sleep on now." The disciples didn't wake up spiritually until after Jesus' resurrection.