You’ve just reached the end of a book . . . what do you do now? Savor and muse over the book? Dive right into the next one? Go take the dog for a walk, the kids to the park, before even thinking about the next book you’re going to read? What?
(Obviously, there can be more than one answer, here–a book with a cliff-hanger is going to engender different reactions than a serene, stand-alone, but you get the idea!)
It does depend on the book to some extent. If it was a "heavy" book, I might wait until the next day to start something new. Of course, I usually have more than one book going at once, so it would be unusual for me to finish everything all at once. I do tend to take a break before reading more of the same genre, unless it is a series that I am anxious to find out what happens next.