Commentaire sur La Genèse 37:9

ויחלום, in this dream the meaning is crystal clear. Sun and moon refer to Joseph’s parents, whereas the stars refer to his brothers, seeing there were 11 stars in the dream and Joseph had eleven brothers. All the dreams the content of which the Torah described are to be understood as posing a riddle, a challenge to translate the symbols described in the respective dreams into the matching reality in the “real” world. This is true not only of Joseph’s dreams, but equally of the dreams of the cup-bearer and of the Chief of the bakers whom Joseph met in jail. Also Pharaoh’s dream as related in the Torah, and the dream of Nevuchadnezzar as described in the Book of Daniel follow the same pattern. All of them became reality in accordance with the manner in which they had been interpreted.

ויחלום עוד חלום אחר, “He dreamt yet another dream.” The reason why G’d did not fulfill the events foreshadowed in the dream promptly, as He did with the events foreshadowed in Pharaoh’s dream in chapter 41, may have been that Pharaoh had dreamt both dreams in a single night, whereas Joseph had his dreams on different nights.

'והנה השמש והירח וגו, “and behold, the sun and the moon, etc.” we read in B’reshit Rabbah 84,11, that when Joshua commanded the sun to stand still in Joshua 10,12, the sun refused to accept his command until he added: “did you not bow down to my forefather already?” (Joshua was descended from Ephrayim, son of Joseph) Upon hearing this, the sun complied with Joshua’s command.