Apparently, the person in question had a dream in which he was being shown around heaven. He was shown three separate rooms, two enormous and one quite small.
The guide showed him into the first room where there were many angels, too many to count, sorting out all the prayer requests and categorizing them ready to present to the Almighty. They worked 24/7 and, despite the myriads of angels, were quite unable to keep up with their work.
The second room was of a similar size with as many, maybe more, angels who were recording the many answers to prayer.
The third room was much smaller with only one angel in it who was crying with boredom and spent most of the time asleep with so little to do. It seems that his job was to sort out the thanksgivings for answers to prayer.
The remedy: remember to say Thank You!