Wow how strange. I've just recovered from a really bad cold/fever. So it was interesting to see how my dreams were.
For me I found the constant interruptions in my sleep from coughing and a high temperature worked a bit like WBTB. I found myself having lots of short lucids but they were especially surreal and the mood was dark. More like lucid nightmares.

I eventually discovered an old cure from my grandmother: whiskey, blackberry juice and ginger, before bed, seemed to really help falling asleep and made my dreams longer and stranger.