@tanza I thoroughly agree with you (again !) - putting a puppy into a crate for a nap - poor little animal probably thinks he is in a prison - and that having to take a nap when he may not want one is some kind of punishment.
A nice comfy bed beside a radiator, with a favorite toy and a bone and he will nap when he needs to once he learns that is HIS place and he won't be disturbed when he is sleeping there.
Puppies nap for shorter and longer periods, as they need to - you can't regiment them !
L