Dear @j-e-f-f , thank you for your recommendation.
I was figuring out how to put everything in stand by mode so my screen would be active when I am sleeping ( have it hanging in my sleepingroom).
Dear @radokristof , thank you very much for your reply.
I did not figured out then I will try your solution whith powering off the HDMI port.
Anyway guys, thank you for your interesting replies.