I can't believe that this thing really works. It's great for driving - it helps to break the "highway hypnosis." My wife got me this as a stocking stuffer for Christmas. I took it as a gag gift. I took it with us on a 1500 mile round trip to try it out and it really worked. I'm tempted to buy one for each of my employees to use (and me too) for the time in the afternoon following lunch when everyone gets groggy.