I know this is odd tk ask, but I read somewhere that the average person only dreams a few hours 1-3 during a full nights rest. However I fall asleep and start dreaming instantly sometimes and dream 3-5 hours a night. I can even dream while I am semi-awake. Also when I am asleep I can still hear, think, and hold conversation. The problem with that is I cant fall asleep to music or TV, and I have said some things in my sleep that I regret people hearing.
I dream the minute I fall asleep and to the minute I force myself to wake up to save myself from my nightmares.