“It’s wonderful to have so many hours in my day – I
  feel like I can live two lives,” she says.

  ...

  “There’s this social view that short sleeping is a good 
  thing and should be encouraged – we’re always hauling 
  out the example of Margaret Thatcher and top CEOs who 
  don’t need much sleep. In fact, the amount of sleep you 
  need is genetically determined as much as your height 
  or shoe size. Some people need very little sleep, 
  others need 11 or 12 hours to feel their best.”

I don't think sleeping less is only better from a social view - like this lady says, she sleeps 4 hours and she feels like she can live two lives. If I need to sleep 12 hours to feel rested, doesn't it stand to reason that I can only live half a life? Maybe sleeping less than you need to feel your best is a worthwhile trade if you can spend more time living...