SAN JOSE, Calif. — In a recent online poll of 382 business managers, some 71 percent of respondents said that they have fallen asleep or been sleepy during an “uninteresting” presentation, according to a survey by Infommersion Inc. Some 43 percent of respondents have caught other people dozing, according to Infommersion (San Diego), a developer of data visualization software. The most difficult types of presentations to remain fully awake through were individual speeches (35 percent), followed by training sessions (23 percent) and then general meetings (16 percent), according to the software firm. Webcasts revealed themselves as the easiest type of...