I honestly haven't read much sci-fi. I typically stick to non-fiction when I read. Otherwise my Jness gets me to feeling all guilty for "wasting" time. However, even I need to relax my grey matter sometimes, and I can justify an hour or so staring blankly at the 'set.
Edit: I realize how absurd this is since I could just as easily spend that same hour reading. So! Book recommendations also still welcome.