Well, let's see...

Anytime I drive my vehicle down a road I ride my bike on, I can't stop visualizing the bike (I kinda space out and forget I'm suppose to be concentrating on driving).

I love spin class inside, any music I hear, I can't stop thinking about what my cadence would be to the beats per minute of the tune.

And my screen saver on my cell phone is a drop on a mtb trail I ride that I have chickened out all season going down it... it's there to stare at me every day in the face until I ride it like I own it.

Sooo... nope, from where I see it, things like having night time dreams about your bike is perfectly normal.