One of the first things I do when I wake up in the morning is open all of my blinds. I love the way natural light makes my house feel. Everything seems so fresh and clean when the sun is shining into the family room.
I used to live in a house that had close to 20 windows on the main floor, 9 of which were basically floor-to-ceiling. It was AWESOME! I hope I can live in a house that allowed so much light to come into all the rooms.
If you're not already, open your windows everyday! The sun really does make such a difference.