I notice much more pollen being brought in in the mornings than other times. I strongly suspect it is due to the nurse bees demanding it after a long night of feeding larvae and using up the pollen stores. Bees don?t just go out and collect food, the nurse bees tell the field bees what they need. In the morning it is a lot of pollen, then nectar, when it gets hot, they call for water. Quite often I see them again bringing in a lot of pollen.
Jim Altmiller