I don't know about sleeping, but I like the idea about eating and drinking at least. I implemented it on my own project server, and it's pretty easy to do, albeit a bit time consuming. There are already existing food and drink items, and the Radiation scripts work great as a template.
I would personally like to see it in 2238, but like everything else it completely depends on whether or not the devs want to do it, as is their prerogative.
I'm in favor of it, though.