The Western Union Company is an American money transfer and financial services company. The company has more than 486,000 locations worldwide in 200 countries. Western Union offers person-to-person money transfers, money orders, business payments and commercial services.
One such technique to stay awake is to drink coffee (or tea, for some). Drinking hot beverages is very common for students while cramming in their final studying on the eve of exams. Somehow, drinking coffee or tea (caffeine-rich beverages) helps you stay awake.
If you block the effect of adenosine with caffeine, then you will feel more awake. But, later on, when the coffee effect wears off after it gets eliminated, which takes 4 hours or so, the adenosine is still there, and then that may kick in and make you feel sleepy.