On the night Jesus was arrested, the Gospels tell a familiar story (Matthew 26.36-46; Mark 14.32-42; Luke 22.39-46). Jesus, in great distress about what He knows will soon happen to him, takes Peter, James, and John with Him into the Garden of Gethsemane. Jesus asks them to be in prayer and then withdraws to pray by Himself.
Jesus’ prayer is famously filled with agony and desperation: “Father, if it be possible, let this cup pass from me; nevertheless, not as I will, but as you will.” He comes back to check on his friends, and finds them all asleep. He rebukes them, and withdraws again, praying the same prayer. Then He returns to find them asleep again, and the pattern repeats again a third time.
After the third time, a mob arrives and arrests Jesus, and as He predicted, His disciples flee in fear.
Conjecture: might it be that Jesus was strengthened by His night in prayer with the Father, and was thus now steeled to face the ordeal of mockery, torture, and death that loomed before Him? And as the same time, could it be that in their slumber, the disciples deprived themselves of the means to remain faithful to Jesus during the hour of trial?
As Christians, we pray to change circumstances and events around us, but we also pray (or maybe even, we primarily pray) to change us. Prayer helps to bring our wills in line with God’s will, to strengthen our resolve, and to quiet our fears. I have a hunch that if Peter, James, and John had heeded Jesus’s request to pray with Him on that fateful night, their behavior during the trying times that followed might have been very different.
James A. Harding once said, “[Prayer] is an enormous power, the mightiest that can be used by a mortal, that few of us use as we could and should.” When we sleep (literally or metaphorically) instead of pray, what transformation do we miss out on? In what moments of trial do we desert our Lord because our resolve has not been strengthened in prayer as it could be?
 James A. Harding, “Does God Answer Prayer?” Christian Leader and the Way 19 (September 19, 1905), 8.