I believe that the "night" that Jesus refers to is the time of the final bowl judgements of Revelation that immediately precede his second coming.
It is important to note that at the time of his return, normal human activity continues ie sharing a bed, grinding corn, marrying and being given in marriage etc. His return precipitates a separation of humanity. Those who are living in faith towards him rise to meet him in the air. Why? Why do they not go to heaven and meet him there??
I believe that the reason is that Jesus and all the redeemed with him, together with all of the angelic host, have left heaven in order to bring God's rule to the earth and to establish the Millennium. The establishment of his rule will mean "the removal of everything from his kingdom that causes sin and all who choose sin." Thus there is the most terrible separation of the redeemed from the condemned.
We know that "God takes no pleasure in the death of the wicked, but rather that the wicked one turns from his evil way and lives." It therefore gives God no pleasure whatsoever to remove a human being from his presence, but if that one has chosen evil rather than Him, God respects that choice. However that choice becomes fixed forever at this time of judgement. The parable of Dives and Lazarus makes it abundantly clear that the separation of the believing and the unbelieving is final.
Thus, the final bowl judgements are designed to say to those who are right on the very brink of hell "Do you really, really want to choose hell rather than Me? If you do, then I will respect your choice!" Within these bowl judgements, which are the very brief period of time at the end of Daniels final "week" of seven years, there is still time to repent, but normal human work and life will be utterly impossible.
The silence in heaven for "half an hour" in Rev 8:1 is precisely because of the devastating judgements that are about to be poured out upon the earth. These are listed through the rest of chapter eight, whose final verse concludes "terror, terror, terror to all who belong to this world." (Note that Hebrew uses a word three times to give the maximum emphasis cf Is 6:3. Though Rev is written in Greek, the thought forms are ALWAYS from the Hebrew, as in all of the NT)
Note that the redeemed are STILL PRESENT on the earth, but are protected by their sealing from judgement (9:4) They remain present until the seventh trumpet is sounded and "God's mysterious plan will be fulfilled" Rev 10:7 At this point, the world has experienced the first three woes/terrors of Rev 9 which observes the lack of repentance v20,21.
The point of this is that they could have repented. They chose not to. The redeemed were still on the earth as a witness, protected by God. After the last trumpet issounded and the redeemed are removed from the earth, the seven bowl judgmements of Rev 16 commence. These judgements are so terrible that normal human work becomes impossible. This is very obvious from their descriptions in this chapter. I believe that this chapter 16, the time immediately preceding Christ's arrival, is the time "when no man can work."
I would greatly appreciate feedback and comments on this very, very important teaching of Jesus.