Insufficient daytime light and excessive nighttime light disrupts the body's natural circadian rhythm, leading to a delayed wake rhythm and reduced daytime alertness.

“And what that does, our brain thinks that it's daytime later than it should, and that shifts our alertness rhythm, and there's two consequences to that. It means that, because it's shifted, our wake rhythm is starting too late in the day the next day, and that means it's going to be kind of under-stimulated during the day, our brain is not going to have enough of that wake drive. And so therefore we need coffee, right?”