Maybe sun exposure?
thats all i can think of

Perhaps because when you sleep your heart rate drops, so there won't be as much blood flow to your skin when you wake up. The redness in some areas may be due to the thinness of skin in scarred areas showing blood flow underneath.

I don't really have an answer for you, but I just wanted to say that I'm in the exact same boat with you. I do just the same as you do, and I always get a little excited in the morning when I see they are more faded, haha. I'm just glad I'm not the only one who notices this!
The only things I could think of would what d00little said, or maybe just because you've been in the dark for a long time and your eyes just haven't adjusted to the lights? Maybe it has to do with sun/light exposure as well.

your body temp is lowest at night/morning and rises during the day. so skin will look less red when you wake up

Perhaps you have post inflammatory erythema (PIE)? This threadand this Reddit discussion both give good descriptions and information.

In the morning, my skin is always more plump. I think it just has to do with lying down flat. For redness, I've managed to get rid of it by going grain free.