There's a small "ZZZZ" displayed next to the city icon on the far left of the screen but yea, it's kinda easy to miss. On the other hand, sometimes you want your city to be idle(there are specific city bonuses that only work for idle cities) and having a prominent pop-up come up every turn could become annoying.

Yes just a pop up when it first stops building. I always miss the little zzz way over in the corner!

I think that iddle cities with the "Zzzz" should appear on top of the city list at left screen, so you can realize of them, instead of having to scroll up and down each turn, once you have a lot of cities.

And that of iddle cities that make research is annyoying. Maybe there should be a mode that put a city into

 - Research. Focus the production to research. (This is like the current iddle ones.)

 - Bussiness. Focus the production to make Gildar

This way, the iddle cities are really iddle, and the cities that have nothing to build (or you prefer them to do), will have something productive to do.

I wholeheartedly agree with this thread, the game REALLY needs this. also what SOLOSOL said about being able to convert hammers into beakers or gold.

  I just watch for the sleeping cities icon, but I can understand the objections from others.  Would be nice if a future version of the game after release adds a checkbox that pops up a message whenever you have a sleeping city.

Mind, I think anybody who used this would quickly realize how cumbersome it is, but maybe that's just me.

Agreed, Said so before
Help us airheads out!

Sincerely
~ Kongdej