Indeed. And ironically neither does what we call life. That's why philosophers, biologists, etc. have a hard time to determine its boundaries or come up with a fitting definition. After all, Reverie and Spike (as well as all other forms that exist now) go all the way back to the very first moments of Big Bang (or whatever was the way this Big Dream started). I would also say that with some training there is a possibility to notice all the different transitions between various states of awareness, but that's just nitpicking on my part (and I must admit, I'm not that into "meditation Olympics" or lucid dreaming and with psychedelics it's always a hit-or-miss :D).