Switching off the light is the moment this speaker replays the day. Darkness arrives without effort, as naturally as the earth circling the sun, and with it comes a kind of review of everything that happened. The list is not cheerful. Some days nothing happens at all. Some days the speaker is put down by their own people, which stings more because it comes from those who should be on their side. Other days they are treated as if they don't exist.
Then comes the final line, set apart on its own: only about 10% of the time does something good happen. The tone is flat and matter-of-fact, almost like reporting statistics, and that makes the loneliness feel real rather than dramatic. The mood is quiet, tired, and a little sad, though the small scrap of good keeps a thread of hope alive. The title, "lights on," hints at a wish for brightness that the poem never quite gets.