Childhood dream

So when I was a child (around 3rd grade age) I was sleeping over at a friends house and had a very odd dream that I still remember. All there was to the dream, was my friends families and I, had been enslaved by a group of grey's. They all had "Z" on their forehead and didn't speak. They were making us run laps around our neighborhood. Then they forced us in to the house and that's about the time I woke up. The odd thing is, that was well before I started researching aliens, or even knew about grey's. In my opinion at that age, I still thought of aliens as little green men. There might not be anything to it, but I thought I would share it.