Sorry if i'm completely wrong, but It's worth a shot.
Why don't you create an even on the maps that you want the enemies on. Make is a parallel process, and make a conditional branch that checks if it is night. If it is night then flip a switch called "night enemies" and make that you check the -handle if condtion not met (or whatever)- box, and under where it says else if, turn off the night switch and turn on the "day enemies"
Now on your enemy page create the 2 pages with the night and the day enemies. On the day enemy page, require the day switch, and on the night enemy require the night switch.
That should make it so if it is day, it will show day enemies, and if it is night it will show night enemies.