I started watching a new NBC show last week (and caught up with all 8 current episodes) called Awake. The basic premise of the show is that a family has a car accident. The father (a police detective) wakes up in a reality where his son is dead.  In that reality he goes to sleep and wakes up in a reality where the wife is dead, but the son is alive.

In essence, this guy is getting no sleep, since in one place he lives one life with his wife, and in another he lives a life with his son.  In these two universes he's got a different therapist, as well as different police partners. Each week he solves crimes by using what he learns in one reality to solve the crimes in the other, and we don't know which "reality" is the "real" one. There are some hints that something fishy is happening (his police captain is acting a bit weird), and the Son and Wife each have established plot lines when he isn't around.

This seems like an interesting concept, and I will keep watching.  Personally I think that in the end we'll find out that he is in a comma and they are both dead.  I'm sorry, but Lost really ruined me. That crappy ending has made me cynical ;-)