i often bring something.. especially on a long booking or really late at night (usually ask a few regualars if they want anything) or some fruit, food, chocolate, kfc, some fresh flowers from the garden. Apart from it being courteous, its a shit job and it brightens them up (and their rooms that they live in) also the hours suck, and they rarely get time to eat. Besides, its always a better punt if they are smiling a little. (and i dont mind a snack too)