Genesis 40:5

ויחלמו חלום שניהם means AND BOTH OF THEM DREAMED A DREAM — This is the real meaning (that שניהם is the subject of ויחלמו and is not to be connected with חלום). A Midrashic explanation is, taking חלום as construct case: each dreamed the dream of both of them — i.e. he dreamed his own dream and the interpretation of the other’s dream. This is what it means when it states (v. 16) “And the chief baker saw that he had interpreted well”). (Genesis Rabbah 88:4; Berakhot 55a). איש כפתרון חלמו EACH MAN ACCORDING TO THE INTERPRETATION OF HIS DREAM — each dreamed a dream consistent with the interpretation which foretold the future that was to befall them.

וַיַּֽחַלְמוּ֩ חֲל֨וֹם שְׁנֵיהֶ֜ם אִ֤ישׁ חֲלֹמוֹ֙ בְּלַ֣יְלָה אֶחָ֔ד אִ֖ישׁ כְּפִתְר֣וֹן חֲלֹמ֑וֹ הַמַּשְׁקֶ֣ה וְהָאֹפֶ֗ה אֲשֶׁר֙ לְמֶ֣לֶךְ מִצְרַ֔יִם אֲשֶׁ֥ר אֲסוּרִ֖ים בְּבֵ֥ית הַסֹּֽהַר׃

And they dreamed a dream both of them, each man his dream on the same night, each man according to the interpretation of his dream, the butler and the baker of the king of Miżrayim, who were bound in the prison.