John Chrysostom

"And there sat in a window a certain young man named Eutychus, being fallen into a deep sleep: and as Paul was long preaching, he sunk down with sleep, and fell down from the third loft, and was taken up dead." And the wonderful circumstance is, that though he was a youth, he was not listless and indifferent; and though he felt himself weighed down by sleep, he did not go away, nor yet fear the danger of falling down. It was not from listlessness that he slumbered, but from necessity of nature.

Homily on Acts 43 ↗

Theophylact of Ohrid

Having weighed down the listener with sleep, the devil disrupted the feast. The young man was sitting on the window at night — so great was his desire to listen. And it is worthy of admiration that, being a young man, he was not careless, and, weighed down by sleep, he did not leave, nor was he even frightened that he might be pushed off, because he fell asleep not from inattentiveness, but by the demand of nature.

Commentary on Acts ↗

Bede

Awakened from sleep, he fell down from the third loft, etc. During the words of preaching, an opportunity for healing arose, so that the word might be strengthened by the sweetness of the miracle and the doctrine, and the labor of vigils might be warded off, and the memory of the teacher soon to depart might be more deeply impressed upon minds. Indeed, the three lofts in which Paul was disputing represent faith, hope, and charity. But the greatest of these is charity (1 Cor. 13). …

Commentary on Acts ↗