Yes puppies it is very hard to know. I know with my first I tried everything, I read all sorts of books and I tried different techniques. But she only slept for 40 minutes at a time, for 24 hours. Its exhausting and tiring but eventually she slept longer and eventually I learned to trust my instincts better and parent by instinct rather than by a book. Once I did that, I was able to relax and get on with things like work and life. Try reading some other books like "Parenting by Heart" by Pinky McKay... just for balancing different parenting books.