dream of long math classes and night-time hometown

I was attending a week-long class that consisted completely of mathematics. At the end of one day, I was standing outside a building in my old hometown. My mother was there and kept asking me why I was taking such a long math class. After a while I got tired of listening to her, so I got in a car and drove away, telling her I’d be right back to pick her up. It was night-time and I could see a small bit of slush on the road reflected in the orange glow of the streetlights. I drove a couple of miles up the road and took a left, thinking that I’d be heading downtown and could double back. Instead, I ended up in a neighborhood not far from where I lived in Portsmouth. It was still night and everything seemed abandoned. I kept driving around, but I knew I was never going back.