Relation between intelligence and sleep, immune system or inheritance?

[Gerenuk]

Does anyone know studies which link intelligence to
a) sleep (duration)
b) immune system (weak/strong)
c) inheritance (how much inherited, from father/mother?)
I vaguely remember hearing some results to each of these topics.

 

[CRGreathouse]

I just know I've been to a website with correlates of intelligence -- results from hundreds of research papers summarized into a standard format. But I can't seem to find it now.

 

[CRGreathouse]

As for (c), there's lots of information on that. Searching for "heritability of g" gives thousands of websites like
http://members.cox.net/bvv/h2b.html
http://en.wikipedia.org/wiki/Heritability_of_IQ

If you have access to a college library you can find many papers on the subject as well. Even without, I think PubMed is accessible to the general public (?).