Is there any reason why CC can't have a sleep mode like heroes?

One of my biggest concerns with the new update and shield changes is the fact that I can't control my CC troops to keep them for attacks. With my Th inside, everytime I log on, my cCc has been tapped out in defence. It pretty much means I can't depend on having it in attacks and War. At least with my heroes, I can put them to sleep.
Even when I was trophy hunting, I lest my Th out, so that I could depend on having the max troops available for my attacks.
Would Supercell consider giving Cc a sleep function also?