Lately I find I'm getting sleepy at my desk in the afternoon. I get 8 hours of sleep each night, eat breakfast and tend to have a healthy, not too heavy lunch. My job is plenty stimulating and I have a window that opens in my office, so it's not due to stale air. Any recommendations for a snack or drink that will keep my forehead from hitting the desk? Note: I have a low tolerance for caffeine and am not a huge fan of chocolate (actually, I don't have much of a sweet tooth.) Thanks!!