God often spoke to the Prophets through dreams. In the book of Daniel we read that both Daniel and King Nebuchadnezzar had dreams, and that God used Daniel to interpret Nebuchadnezzar’s dreams and showed him the future. Many of Ezekiel visions happened during dreams in his sleep, and interestingly they also happened around the 5th of the month.
“In the first year of Belshazzar king of Babylon Daniel had a dream and visions of his head upon his bed: then he wrote the dream, and told the sum of the matters.” Daniel 7:1