Mine have all been fine sleeping at night. It usually only takes them a day or two. I keep mine in their crates at night, my bed is too high and I don't want to risk them getting hurt. I put music on and basically let them know that whining or barking will be ignored and the funny thing is that I have recognized their I want out to play whine/bark from their I got to go potty whine/bark. I think the music really helps them, they all quiet down right away when I put the music on. But I have noticed it has to be slow or calming music, they won't rest with the fast beat rock music. I also teach mine to love their crates. Each night I put some treats in their crates, special treats that they really love and only get at night time when they go into their crates.
Now that can't see to get in their crates fast enough. They all just zoom right in their crates because they know they will always get a special treat. In fact Scampers won't even give me a good night kiss, he is just so anxious to get into his crate.
