The point of these examples is that when Jesus returns He will separate people, even those who are intimate companions. The unstated reason is implicit, namely to judge some and not the others. Some will be ready for His return and others will not. The idea of sudden destruction resulting in judgment runs through the entire passage.
The presence of two men in one bed may be another indication of the moral condition of that time, but the main idea is their close association. It was common for a mother and daughter or two female friends to grind grain together in Jesus' day (cf. Matt. 24:41). Perhaps Jesus intended the fact that one separation takes place at night and the other during daytime to reinforce the fact that He could return at either time. Of course, whenever He returns some people on earth will be sleeping and others will be awake. Those taken will experience punishment and will die while those left will enter the kingdom since they will be believers. This is the opposite of what will happen at the Rapture (cf. 1 Thess. 4:13-17). Then Jesus will take the godly into heaven and will leave the unbelievers on earth to enter the Tribulation.398
A scribe probably inserted verse 36 (cf. Matt. 24:40). It is absent in the best ancient Greek manuscripts.
