Possession.  I am in possession of much.  I have the tangibles -  clean water, food, property, and even luxury goods.  I have the  intangibles - love and support from family and friends.  I even have romantic love available - if I could open myself up to it.  In short, I'm lucky, and I know it.
I  have all this, so why do I feel the sadness attributed to lack?  Maybe  what I'm missing is something to dream about.  The dreams I had about  what my life could be were so very vague in my youth, and have  subsequently been swept away by rejection and failure in the last  decade. The reality of rejection and failure is so prevalent that I can  no longer expect anything else. I now fully expect to fail, or to be  rejected, and no dreams intrude on this reality.
So when I lay down on my pillow at night I do not know  what utopia, what possession, what fate to think about.  What  do you dream of when you believe you can never possess that dream?  The  answer, of course, is that you only sleep; you embrace the numb stasis  of slumber and dream of nothing at all.
"The world of men is dreaming, it has gone mad in its sleep, and a snake is strangling it, but it can't wake up."
-David Herbert Lawrence