Mandukya Upanishad
With an Advaita Commentary from our Understanding
by Kenneth Jaques | 31,733 words
The Mandukya Upanishad is a short, just twelve verses, description of the material manifestation and the eventual return to unmanifest form of the Universe....
Verse 35
35. Having conversed together with his friends etc., one when re-awakened does not attain to all that; and further whatever had been taken by one in the dream, one when re-awakened does not perceive.
While dreaming one can have a conversation with friends and family but after waking those same friends or family members will have no similar memory of such conversations. Further, if in a dream one picks a flower that flower does not exist on awakening. This shows the dream objects to be false.