Mark 14:37

And he cometh and findeth them sleeping
His three disciples, Peter, James, and John:

and saith unto Peter;
particularly, he having so lately asserted, with so much confidence, his love to Christ, and close attachment to him:

Simon, sleepest thou?
Christ calls him by the name he first went by, and not by that which he had given him, Cephas, or Peter; he not now having that firmness and constancy, though he boasted of it, which answers to that name:

couldst thou not watch one hour?
The Arabic and Persic versions add, with me; and so does the Complutensian edition; (See Gill on Matthew 26:40).