Lol, I had noticed the same thing, but, since do not know a lot of modern movies, could not give specific examples.
However, I do remember some examples from literature, again, not too many specisic ones.
In "East from Edem" by John Steinbeck, Adam Trask is having trouble talking about his time in the army, specifically about the war with Indians.
In "Singing in the trees" by Colin McCallow (sorry for possible mistranslation and misspelling), James, Patrick, and Leon Hartgeim have clear PTSD symptoms, like avoiding close relationship with their families.
In "Nobody writes to the Colonel" and "100 years of solitude"by Gabrial Garsia Marques the cherachters have noghmares and frequent memories about the war.
And just it was a number of times whan the character of some book woul tell something like this, refering to their traumatic events:
-I still see that in dreams, and wake up scared...
or
-I still remember that and will remember to my last day...
I also remember the examples from Russian literature, probably, that will not tell you much.
For instance, that was a beautiful poem, written by the Russian lady who had been through the WWII as a combat medic:

Just ones I had seen a real one-to-one fight.
Just ones in the real life, and countless times in the dream.
Whoever says that the war is not scary
Does not know anything about the war.

In all her poems, even those written in late 80s, you can see the memories about the war.

Another poem, written in early 40s, about the civil war:
Night after nignt, no sleep for me.
The gun is in my hand,
And I am ready to fight,
As 20 years ago during the war.

Finally, there is a movie, also the Russian one, which I would advise you never to watch. It is called "Come and see", and it is the most realistic war movie ever made. I had seen it twice, first as a kid (probably a mistake of my parents), and then in my teens. Second time I could not watch it to the end.
You can see the young guy is simply loosing his mind from all the brutality he is witnessing.