Yesterday I was staying awake until late hours on the Internet
I was very tired.. then I saw a black color line tends to a little green
What's mean that ?

Not sure what you mean by saw a black color line tends to a little green
BUT I do know the more you are on the internet (especially playing games and animated sites) the more your mind plays tricks on you. Sometimes when I play the video games
I see the game pieces in my mind and have a hard time stopping it.

Thanks for you being help me
This is very helpful especially that I noticed something
And sure it's badthing