The invisible guy is, in layman's terms, the thing that FORCES you to sleep. But since you were stuck in an event, it couldn't do so. I do agree some events are a little ridiculous because you need to enter a specific trigger zone to get them to end and where it is isn't immediately obvious. One event you need to stand in front of your PC where the signal terminals are. Not next to the terminal, not directly in front of the main window, not outside it, specifically in front of the chair. Super annoying, but it be what it be.