Mark 14:37

14:37 Then he came and found them sleeping, and said to Peter, “Simon, are you sleeping? Couldn’t you stay awake for one hour?

Mark 14:40

14:40 When he came again he found them sleeping; they could not keep their eyes open. And they did not know what to tell him.

tn Here καί (kai) has been translated as “then” to indicate the implied sequence of events within the narrative.

tn Grk “because their eyes were weighed down,” an idiom for becoming extremely or excessively sleepy (L&N 23.69).