Ok here is what I have personally observed the past several days after recognizing the recent posts about this. I am located in southeastern Michigan. Every night I get out of work at 5:30 EST. A co-worker drops me off at home 3-4 nights a week. I arrive promply at 5:45 in my driveway, every time she drops me off. About 3-4 weeks ago she made a comment, "Wow, your house is so dark." I told her I know, I usually turn my porch lights on as soon as I get home because it is very dark here. When she made that comment I recalled vividly that is was DARK DARK out and clear out. Just 2 weeks ago I commented to her this time "man my house really is dark without the lights on huh?". There was no twilight left at all, and with my porch lights off it made my home outline and yard very dark, and difficult to see. Now, today rolls around and the same routine... pulled in at 5:45. Immediately as I was getting ready to exit the car I said wow thats weird. It was definitely still twilight out... not much though. But noticeably lighter, enough to where I could see the outline of my house against the sky very easily, and I noticed that finding my keyhole was much easier than weeks prior. Usually I fumble with getting the key to fit, my porch overhang really gets dark underneath. So, YES the evening sky has began to lighten up already. Very strange seeing how it should be continuing to darken at least until tomorrow. And I have already ruled out overcast/clear skys for a possible reasoning for the early lightening, it was always crystal clear and cold out the nights it was dark when I arrived home. I might have noticed this earlier this week, however the skys HAVE been overcast all week, the skies finally cleared up this afternoon allowing me to notice I think. This might be something to really pay attention to here.