Caffeinated.

Sleep is a side effect of caffeine deprivation.

More Americans are drinking a cup of coffee every day, putting Java virtually neck-and-neck with such soft drinks as cola, according to an industry report released on Saturday.

Preliminary data from the National Coffee association of USA's "2006 National Coffee Drinking Trends" showed the percent of U.S. consumers who drink coffee each day rose to 56 percent in 2006 from 53 percent in 2005 and 49 percent in 2004.

Source:  Yahoo News.