In my journey through Acts I read this:
On the first day of the week we came together to break bread. Paul spoke to the people and, because he intended to leave the next day, kept on talking until midnight. There were many lamps in the upstairs room where we were meeting. Seated in a window was a young man named Eutychus, who was sinking into a deep sleep as Paul talked on and on. When he was sound asleep, he fell to the ground from the third story and was picked up dead. Acts 20:7-9
They were on the 3rd floor of the building and Eutychus fell asleep and then fell out of the window while Paul was talking. Fortunately Paul was able to raise him from the dead and we can tell from the scriptures that Eutychus wasn't bored. It was clearly less like preaching, and more like discussion, and the group was grateful to have that time with Paul and "were greatly comforted" as we read in verse 12. So, it probably wasn't that Paul was boring, but maybe Eutychus was up too late playing Playstation 3.