For almost all of my dreams, I can only remember enough details to write a few sentences down on paper. If the later REM periods can last up to an hour, why is it that I can only remember a few minutes of your dreams? Is it that you are forgetting the rest, or is it that time works differently in your dreams and an hour-long REM period doesn't actually produce an hours worth of dream content?

When I play one dream back in my head it lasts maybe 15 seconds. Does this mean I was only dreaming for around 15 seconds?