I recommend this to everyone.
Penrose and Hameroff came up with a theory for Quantum Consciousness in the 1990's - the evidence is really starting to build up.
Quantum coherence in micro-tubules in neurons could be a good start to understanding consciousness. Photosynthesis has now been shown the be a quantum process, so something every plant does relies in quantum coherence across numerous molecules makes a similar process much more likely in micro-tubules.