When we read, especially in the dark, we start to feel tired, is this due to the brain?

Question: When we read, especially in the dark, we start to feel tired, is this due to the brain?
- Keywords:
  dark,
  read,
  tired
Asked by alexread1997 to Damien, Rachael, Simon, Suzi, Tim on 15 Jun 2011.
- Suzi Gage answered on 15 Jun 2011:
  
  Hi @alexread1997
  I’m afraid I’m not sure of the answer to this.
  It may be that when you read in the dark, it’s actually bedtime, so that’s why you start to feel tired?
  
  🙂

Question: When we read, especially in the dark, we start to feel tired, is this due to the brain?