To be frank, I don’t see your point. A few minutes per day is well within the natural variance of human sleep. Proper circadian functioning is even more impor

To be frank, I don’t see your point. A few minutes per day is well within the natural variance of human sleep. Proper circadian functioning is even more important in extreme or alien environments. Solar time won’t work on the dark side of the moon, either. Likely the solution here is a completely artificial cycle based on indoor lighting, as exists on submarines. There will be some kind of time zone divorced from the sun in any scheme chosen here. Solar time works best where when the sun works.