Do dragons sleep?

[Majoru Oakheart]

(Snipped SRD quote about death)

Yes, but notice how it says how to GET to death but not what penalities death gives you. What are penalities to hit and damage do you get? Do you have to make concentration checks to cast spells?

Obviously, I know where you are dead you can't do much of anything...but the rules don't actually tell you that.