General anesthesia is a reversible coma, not a deep sleep.

@article{SandlinLeming2011GeneralAI,
  title={General anesthesia is a reversible coma, not a deep sleep.},
  author={Debbie C Sandlin-Leming},
  journal={Journal of perianesthesia nursing : official journal of the American Society of PeriAnesthesia Nurses},
  year={2011},
  volume={26 2},
  pages={122-3}
}