There is no morning light exposure either way. Seriously. You are talking about "scientific evidence" from completely different time zone with completely different light conditions and completely different lifestyles. There are multiple hours of dark between sunset and going to sleep in the winter anyway. You are waking up into dark and going to school/work anyway.

And only very few people are like leisure or outside sport activities in the morning before going to school or work. It is just not that relaxing when you have to watch the clock or take longer shower after.