You are kind of in the hole Keyera, I experence it myself being a late night west coast guy.

You're too late for Us guilds and too early for Euro and Aisa Guilds.
I even tried to start a chat channel for people like us to find things to do at that time of night rather than just mindlessly grind away exp.

I hope you find a good guild to play with at that time, but as far as I know none exist.