In a T+D article, synchronous learning expert and author Jennifer Hofmann wrote, "Teaching online is like teaching after lunch." In case you're not familiar with the post-lunch phenomenon, classroom trainers jokingly refer to it as the "Teflon hour" because nothing sticks. It's a challenge at this time of the day to keep participants' attention and to engage them in the class. In a virtual classroom, the problem of engaging participants is even more pronounced.