Think of the "knee-jerk" reflex you get when the doctor hits you on the knee. It's a response to a stimulus, but it happens without even any involvement from your brain: it's just a round trip to the spinal cord.[1] I don't think that's what we usually think of as "awareness", which happens at the cognitive level. Reflexes like eye-blinking are even operational when you're unconscious.

[1] http://en.wikipedia.org/wiki/Patellar_reflex