A Dream Within a Dream

Lately I've been thinking a lot about dreams. It's as if you're in a different world - you get transported to the land of your mind. Once I was told that dreams always have something to do with a memory, story, or something you've been thinking about, even though sometimes I have dreams that have nothing to do with anything recently. Is it just from the deep depths of our mind, or is it something completely different? Sometimes I fall asleep in my dream, and don't wake up until I really do, but I never remember my dream within a dream.

A Dream Within a Dream
Take this kiss upon the brow
And in parting from you now
Thus much let me avow -
You are not wrong who deem
That my days have been a dream;
Yet if hope has flown away
In a night or in a day
In a vision or in none
Is it therefor the less gone?
All that we see or seem
Is but a dream within a dream

I stand amid the roar
Of surf-tormented shore
And I hold within my hand
Grains of the golden sand -
How few! Yet how they creep
Throngh my fingers to the deep
While I weep - while I weep!
O God! Can I not save
One from the pitiless wave?
Is all that we see or seem
But a dream within a dream.
 -Edgar Allen Poe