I have had 'Dreams', when my meditation vears a bit towards the sleepy side before. I specifically remember one where I fell asleep (I think), for a short moment, in the dream I awoke on a surgery table, with at least one doctor standing over me, in the dream I fell back asleep and I came back to meditating. It was a weird experience for sure.
In another I had a person give me the name of a book, or scripture to read, ("treatise on wisdom") I had never heard of it beforehand, after the dream I googled it and found it to be a real book, "Nagarjuna's Treatise on The Great Perfection of Wisdom", or at least that is the closest thing I could find to it. I at least found it interesting.
"We know nothing at all. All our knowledge is but the knowledge of schoolchildren. The real nature of things we shall never know." - Albert Einstein