John Chrysostom

For it was midnight, and the disciples' eyes were heavy from grief, and their sleep was not that of drowsiness but sorrow.

Catena Aurea by Aquinas ↗

Augustine of Hippo

Now Luke has not stated after which prayer He came to His disciples, still in nothing does he disagree with Matthew and Mark.

Catena Aurea by Aquinas ↗

Bede

And when He rose from prayer and came to His disciples, He found them sleeping from sorrow. And He said to them: Why do you sleep? Rise and pray, lest you enter into temptation. That is, lest the cup of my passion fall on you. Where He clearly shows that He prayed for them too, whom He diligently warns, by vigilantly and praying, to be participants in His prayers.

On the Gospel of Luke ↗

Bonaventure

Seventh, as to the circumspection of prayer, he adds: And when he had risen from prayer and had come to his disciples, he found them sleeping for sorrow. For he so prayed to God that he nevertheless did not forget his sheep; indeed, he interrupted his prayer three times in order to return to rouse his disciples: whence it is said in Mark 14 that "he came the third time and found them sleeping." In this the wondrous solicitude of Christ for his disciples is apparent, as a hen is solicitous for her chicks: Deuteronomy 32: "As an eagle …

Commentary on Luke, Chapter 22 ↗