I found this possibly dodgy dash cam. You will obviously need to buy a USB battery pack and figure out how to mount it on your bicycle. But it does have IR lighting built in. $60 and you will have to wait for it to arrive from China.

Promotion time!!! 2011 Free Shipping New 120 Degree HD 720p Night Vision 8 IR LED Vehicle Car Camera DVR Dashboard Recorder

http://www.aliexpress.com/store/7001...D-Vehicle.html