Oh, yes. Coffee is the only thing that has kept me going. I have at least 6 cups during a regular school day. It's more like switching a problem for another however. I get too fidgety and distracted to get anything done after drinking coffee (or crunching caffeine pills). Though I suppose I'm no better getting things done while not on caffeine either. Also, as Hooligan said, anxiety either during or after my caffiene highs.