The next morning, O'Brien steps outside his parents' house. He looks at his bedroom window from the driveway and the street. No car headlights could account for what happened. A huge bush blocks the bedroom window. There is a minister who lives down the street.
Weeks pass with no new signs.
The light-show sequel comes seven months later. O'Brien is in the same bed, same room. And the same thing happens. But the lamp wasn't on. You know the rest.