I'm not slouching the Dr. said so!

I'm not slouching I am following this advice from the BBC.

Rishi Loatey of the British Chiropractic Association said: "One in three people suffer from lower back pain..."

"As to what is the best angle between thigh and torso when seated, reclining at 135 degrees can make sitting more difficult as there is a tendency to slide off the seat: 120 degrees or less may be better."

P.S. If my eyes are closed it just means that I am concentrating on a difficult problem, try not to disturb (err wake) me.