There are, I believe, three sets of dreams in the Joseph narrative:
- Sheaves bowing, stars bowing in Genesis 37
- Cupbearer's dream, baker's dream in Genesis 40
- Pharaoh's dreams of cows and grain in Genesis 41
I find it striking that all three sets come in pair, especially since in Genesis 37 and 41 the second dream doesn't seem to add anything much to the first. Is there a literary reason for the dreams being in pairs?