I'm not sure consciousness and self-awareness are the same thing. First is we can be conscious when we sleep/during REM sleep, where it's arguable we are not self-aware. And if not that, we can even do it when awake, for example when we think about a movie, or a philosophical problem, we can have conscious thoughts that are not related to the self. This leads me to believe consciousness is separate from self-awareness. Self-awareness is _one thing_, among many, that the brain can think about and be conscious of.
Sure, but capacity for self-awareness? I'd guess that hamsters dream, and that their subconscious processes (eg, desires for food and sleep and sex), and maybe even emotions, run much like ours. It's just that humans, with more complex neural networks, have more layers added on top. It's similar to how the brain-stems of everything from lizards on "up" function similarly, but humans have more-developed pre-frontal cortexes and so forth. (Don't hold me to those details, please, I'm not a neuro-anatomist! You can see where I'm going with that, though, right?)