Just a bit of advice, but I'd be very hesitant to claim NPCs were doing anything that they don't actually do mechanically. Sleepers don't warp around, they spawn at the sites, as if they're coming out of the sleeper structures. They also aren't actually detectable by combat probes, they also don't collapse wormholes. CCP could make them do all these things for some sort of live event or other, but they won't happen in normal gameplay, so claiming that they are seems to me like godmodding. Simply, we don't know in terms of PF what the sleepers do and don't do, and its generally not a good idea to make the sleepers start doing things that have (potentially) no basis in the lore. I understand the desire to write a good story, but I would focus the story on your character, your ships, and the things it can be reasonably stated that your character is actually effecting. I had some people in my corporation who wanted to do a story arc about finding sleeper installations on one of our planets, and I had to essentially tell them not to, because we have no idea if the sleepers ever went down to the planets at all. There are plenty of gaps in the lore to write a story, just try not to push outside the bounds of the lore for the sake of something new.