there is an entire category of dreams between 4 - 7 am which can last a very long time
yet you might not even notice them
i had a WBTB wake me up at 6:40 and i thought to myself “oh my i had been dreaming forever” and i understood the gist of them all
then went back to sleep and dreamed even longer
it is the period of time in this early morning in which you can dream for hours and hours , but it is that the dreams are for processing information, and so you may not be lucid, or very present to understand and witness them.