If animations and game lag is what BFS are worried about, perhaps they could make it so that certain dragons are active at certain times during the day. For example, moon dragons could be active 7pm-7am. Sun dragons 7am-7pm. When the dragons are 'inactive', it's just a static image of them sleeping in the habitat. Of course, it may not help those that fill their parks with panlong as they would all be active at the same time. So, perhaps it could randomise which dragons are active and which aren't and then a few hours later, mix up which are awake and asleep again.
You would assume that even if dragons are sleeping, they would still generate coin (unless in the hibernation cave of course). However, if they also made it that when dragons were sleeping, they only generated half the usual coins, it would bring a whole new level of strategy to the game - especially if lower coin generating dragons were awake more of the time. The half coin idea would only work if dragons were awake and asleep at regular times though.
as it is the month of the "pearl". It was emerald this month as this is the month of the "emerald" apparently. They are just making gem stones for each birthstones month. That's why the gem island only has 12 spaces for gem dragons as there are 12 gems in a year
