It is interesting that the timing of Lehi's dream should follow so closely on the heels of Nephi's own conversation with the Lord. Nephi notes in verse one that he goes directly to the tent of his father after his revelation. No doubt Nephi wanted to share his experience with his father, who would surely not only understand, but be able to intimately share such a marvelous experience. Rather than such intimate sharing, however, Nephi is presented with a command from the Lord through his father. Lehi has also received a revelation from the Lord (through a dream, which was Lehi's mode of receiving revelation).
The Lord's timing of the two revelations may have been pure coincidence brought on by two faithful men who happened to pray for knowledge at the same time. It may also, however, have been a purposeful timing to prepare Nephi for what would not only be a hard task, but eventually one which would be a major turning point in Nephi's spiritual development. Given the problems this task would cause with his brothers, perhaps Nephi's conversation with the Lord was a requisite preliminary to having him accept the burdens which would be thrust upon him on this trip back to Jerusalem.