why do we sometimes wake up from a dream and try and scream or talk but no sound comes out?

Question: why do we sometimes wake up from a dream and try and scream or talk but no sound comes out?
- Keywords:
  dream,
  sound
Asked by samschicken to Hayley on 21 Mar 2013.
- Hayley Evers-King answered on 21 Mar 2013:
  
  I’m actually not sure about this! Maybe its because your brain is confused between understanding what you’ve just dreamt and what is real. Good question!

Question: why do we sometimes wake up from a dream and try and scream or talk but no sound comes out?