A friend of mine also has a rex and his squeaks at night, but not in the daytime (temperature-dependent?).
My drivers side window has squeaked literally since the day I bought it. I made them look at it, and at first they said they couldn't reproduce it. But then the dealership mechanic lowered his voice conspiratorially and said, "Look, every Subaru does this. The window tension is much higher because the doors are frameless, and the tension causes the squeek. You're just never going to be able to fix it."
Dunno. I'd still like a fix, but when my passengers raise an eyebrow I just say, "My car is cheaper than yours, is a full second faster from 0-60, and has a better skidpad. What the hell do I care if it rattles and squeaks?"