is it possible that we are all in a coma and if so would wake up in the past or future?

Question: is it possible that we are all in a coma and if so would wake up in the past or future?
- Keywords:
  future,
  philosophy
Asked by Lucy to Connor, Jillian, Lidunka, Sarah, Steven on 15 Jun 2015.
- Lidunka Vocadlo answered on 15 Jun 2015:
  
  @Lucy …er…. no I don’t think so. Good basis for a story though!
- Steven Thomson answered on 15 Jun 2015:
  
  It’s unlikely, but I suppose stranger things have happened!
  
  There are some theories that our universe is just a hologram or a computer simulation, but there’s no evidence for any of these – not yet, anyway!
- Jillian Scudder answered on 19 Jun 2015:
  
  This would be very unlikely! I’d have a hard time believing that so many people could be consistently having the same coma-dream; it would take some hard proof to get me to believe this, and I don’t think this exists!

Question: is it possible that we are all in a coma and if so would wake up in the past or future?