Unable to complete a task dream...what does it mean?

The last couple of nights I've had a dream, slightly different each night, in which I work and try but can't finish a task that's normally not difficult. Last night I was eating lunch in the dream and just couldn't finish. I was rushing through the meal to the point of feeling ill to try and join the others who were done eating and leaving for something. I've been called a slow eater before by family but it's never bothered me ('cause it's true). So that was odd. I don't really remember much of anything significant about the first dream other than the vague feeling of similarity--also unable to complete a task. Anyone have any idea what this kind of dream is supposed to mean?