Thanks, Vaughn - I think that study starts to explain a lot. I wish they'd also look at interrupted sleep. I sometimes get close to 7 or 8 hours a night, but never in a solid chunk. As for the immune system effects, I know my asthma has been worse since having Nate and getting less sleep (I don't think it's just age).
I just hope I can get him into hiking enough that he'll stay safe in the woods with me so I can take him along.