For individuals working night shifts, viewing the setting sun in the evening acts as a morning light cue that promotes wakefulness for their shift.

“So the person who is working say from, you know, 8:00 PM, like sundown to sunrise, this raises a question. Should they be looking at the sunrise and should they be watching the sunset? Waking up with a sunset, going asleep at the sunrise. You think, well, is that light going to throw them off? Ah, probably not. It's just actually going to invert what sunrise and sunset are. When they're waking up in the morning, if they look at the, you know, they get some sunlight in their eyes, they look at the sun and get some bright light from devices or overhead lights in their apartment or home, well, that's going to tend to wake them up if it's in the evening, right?”