Snap to it.
Believe it or not, my students don't usually fall asleep during library class. However, I think I'll try this with them anyway... or on myself for that matter. =)
Stimulating Sleepy Students -- Acupuncturists Show Students How to Stay
Awake by Stimulating Pressure Points
http://www.sciencedaily.com/videos/2006/0106-stimulating_sleepy_students.htm
"Simple techniques inspired by traditional Chinese medicine may help
students stay awake during class. Researchers report that college students
were more alert if they massaged or tapped areas on the back of the
neck, the hands and legs -- areas that acupuncturists believe can
stimulate the release of endorphins."