Charles Ellicott Commentary Mark 14:37

"And he cometh, and findeth them sleeping, and saith unto Peter, Simon, sleepest thou? couldest thou not watch one hour?" — Mark 14:37 (ASV)

Simon, sleepest thou?—Note that while St. Matthew and St. Luke give the question in the plural, St. Mark reports it in the singular, and joins it with the emphatic utterance of the name of the disciple. His report, too, includes the two questions which appear separately in the other two Gospels.