Matthew 26:40

26:40 Then he came to the disciples and found them sleeping. He said to Peter, “So, couldn’t you stay awake with me for one hour?

Matthew 26:43

26:43 He came again and found them sleeping; they could not keep their eyes open.

tn Here καί (kai) has not been translated.

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