If you’re prone to nightmares, you should probably try your best not to fall asleep in class. You might have an outburst in the middle of a quiet lecture, like one student at Stony Brook University.
The professor noticed the student napping in the front row, so he made a loud snoring sound as a joke. The noise must have jolted the napper, because he literally jumped up screaming, not knowing what was going on for a moment.
Even the prof couldn’t help but laugh.