relationship between sleepiness and drive

I'm sleepy these days. In fact, I suppose I couldn't sleep well. Basically I am a good sleeper. There might be other reason. I have been thinking about the relationship between sleepness and motivation. I suppose I am sleepy when I do not feel like doing anything. I can do with short sleep when I would in contradiction to that. I have heard of the man continueing to sleep for a long time. He may not have a drive to his life. People seems to decrease their curiosity about anything as people get old. People may meet their end when they continue to sleep as they can't be interested in anything.