Sounds like he is feeling insecure right now. It’s hard on puppies being taken away from their families where they are used to sleeping in piles with their mom and siblings. I am different than other people on this subject I have never crated any of the six Boxers I have owned at night, I prefer to let them sleep with me and get up at night and take them out when they need to go than have them feel insecure. I did crate most of them only when I left the house.