Count Ants; Fall Asleep
Much better than counting sheep!
To collect data for my research with pest ants, I put out a bait, then wait and count how many ants come to eat it. I have found that there are very few things that can make a person sleepier than counting ants. Try it! 
PS- the ants in the photo are Bigheaded ants Pheidole megacephala

Photo taken at the University of Florida, 
Ft. Lauderdale Research and Education Center.
Dr John Warner, PhD Entomology