it's been a few years since I've read through Anne Rice Vampire Chronicles but I don't recall them getting overwhelmed by the "new world".

What I recall is that vampires who don't occasionally "go to sleep" never make it long enough to become truly strong. In essence, they burn out. Almost as if the world becomes so boring that they must sleep for centuries so they can wake up and find the new world _invigorating_ rather than overwhelming.

In her books, both the original vampires did this, as did Lestat.