Although I really think that tweens and teens will thoroughly enjoy "Sleepwalker: The Last Sandman" I think the book has a great story and meaning to offer to adults as well.  The storytelling is tight and fast paced, but it was the sort of book that you almost didn't want to finish, because you knew you'd miss the characters when the last page was done.  The characters are realistic and even in the most fantastic of situations the author finds them in, you can hear the truth of the characters as you read.