I always thought it was about a guy just living from day to day, doing nothing because he has nothing to do. All he does is sleep and dream. He has an actual dream to do something, and he gets this urge to get up and do it, but he can't figure out what it is he wants to do so the urge simply frustrates him or drives him crazy. In the end, he's sick of living this way but can't see any way out of it, so he simply goes back to sleep, to dream of greater things again.
I always thought it was about a guy just living from day to day, doing nothing because he has nothing to do. All he does is sleep and dream. He has an actual dream to do something, and he gets this urge to get up and do it, but he can't figure out what it is he wants to do so the urge simply frustrates him or drives him crazy. In the end, he's sick of living this way but can't see any way out of it, so he simply goes back to sleep, to dream of greater things again.