If we’re hungry, we should stay awake and eat. If we’re tired, we should sleep instead of eating. It’s obvious that the behaviors involved in eating and sleeping are mutually exclusive. But how does the brain determine which set of behaviors is the right one at any given time? Dr. David Owald, a professor who works in neurophysiology and behavioral science at Charité –Universitätsmedizin Berlin, is delving into this question using the tiny brains of fruit flies as a model.