Blinds Open or Closed?

I love that my office has a window. It's big & covers the entire wall, ceiling to floor. Since I'm in California the sun is always out. I have made it a point to keep the blinds open, so that I don't get bogged down. Then I discovered something happening. I was getting depressed that I couldn't be out enjoying the day. So, for the past 2 days at work, Today & last Friday I kept the blinds closed. It's darker in here & it almost feels like night since the blinds are black & block out the light really well. There's a haze that has settled over my desk. I'm extra sleepy & moving slower than usual.

So, which is better. Slow & tired from lack of sunlight? Or depressed because I can't go enjoy the day? Be unaware of what's out there? Or know what you're missing... it's a tough decision, but I think tomorrow should be a sunshiney-day because today sucked like no other!

*i'll post pics of my 2 options once i'm home... or maybe tomorrow.