How would humans have evolved differently if we had multiple suns?

Question: How would humans have evolved differently if we had multiple suns?
- Keywords:
  Earth,
  evolution,
  human,
  universe
Asked by emilyybrookes to Angela, Gopal, Hannah, Becky, Vince on 19 Jun 2013.
- Hannah Little answered on 19 Jun 2013:
  
  I don’t know. Maybe we’d have smaller eyes because not as much light would need to enter them. And maybe we’d all have darker skin to deal with that extra risk of sun burn. And we’d probably have evolved to have different sleeping patterns.
- Rebecca Cook answered on 21 Jun 2013:
  
  Humans might never evolved at all, two suns would change the environment on the earth which would alter how evolution look place here. Perhaps humans would have evolved somewhere else, maybe Saturn (my favourite planet).

Question: How would humans have evolved differently if we had multiple suns?