Board Thread:Plants vs. Zombies 2: It's About Time/@comment-24671402-20140321220752/@comment-5792287-20140324125632

It said Sunflowers are sleeping, it would be stupid of them to make other plants sleep too, I think they just want to force people to use Sun-shrooms even if they have the extra starting sun boost(s), so they make Sunflowers fall asleep in Dark Ages.

Also, the fact that they say "Dark Ages - Night {LEVEL_NUMBER}" would be because in the other stages, they say things like "Ancient Egypt - Day {LEVEL_NUMBER}". It's to emphasize that it's night-time, it's not because there will be a day version of Dark Ages. By that logic, there should be night-time versions of all the other stages.