Thanks Alijosekt, I will investigate it also tomorrow at my work to see how it reacts
and as i see during a few minutes the "never sleep" works!
Update: I don't think the choice of "Remind me for a WiFi hotspot" really works.
Now I have Rootbox rom (Desire C golfu) and I am ready to change it some time to the new AOKP Advanced!
Update 2: What I have realized, was that when I make a manually refresh to the wifi networks i.e home wifi,
the "never sleeps" works as I checked it a few times! We will see..
Latest update: WiFi fix is ok! I have just realised (from what i had already seen), that the Hotspot problem is because of CM10..!