Creep movement at nighttime

I have just succesfully created the creep spawning system for my arena map and it works quite all right, except for one detail:
When the creeps spawn, they do so behind gates which then open and they are ordered to enter the arena (move to a point that is on the other side of the gates). However, they do not respond to the move order during nightime, because they are apparently too sleepy to move those few meters. :/

I'm now looking for suggestions how to get around this problem (preferably something else than having day all the time, or sacrifising player slots for the creeps so that they don't sleep).

there r a few ways 2 fix this, u could either make it daytime with a trigger so that they dont goto sleep at night cause there wont b night, or u could edit the creeps ur using and just uncheck SLEEPS AT NIGHT.

Yep, the second option worked for me. It wasn't a trigger problem in the end anyway, this could be moved under general development.