After 00:00 they can turn off the light, it makes sense since they go at sleep. And you can make here a little detail. Ori and Flo, the only ones who don't turn it off. Flo can stay with the light because of the fear of the forest behind the hut, or for light's for plants. And Ori always saving us, if we sleep on wild, so it's means that he is watching for forest until 04:00 AM.