In the ancient Orient the upper floor of a home was commonly the one used for social or devotional purposes. Luke writes with the vividness and detail of an eyewitness.
Many lights.
The “lamps,” or oil-fed “torches” (see on Matt. 25:1, 3), are doubtless mentioned for two reasons,
(1) to account for the drowsiness of Eutychus, by suggesting the heat and smoky closeness of the room, and
(2) to provide an indirect answer to the charge that at the night meetings of the Christians they practiced shameless license (Tertullian Apology 8). It would be natural for two or more lights to be placed near the speaker.