Well to help him sleep threw the night, never let him have a nap right before bed. Then when it's time to sleep he will have renewed energy. Give him vigorous exercize before bed. (about a half hour before bed time) I have never heard of the yorkie breed having these problems, so it's not because he's a yorkie. He is old enough now to hold going potty all night now, so if he crys during the night, don't give in. It took Molli until she was 10 months old to be potty trained, so don't give up. Bitter apple works great for chewing on inappropriate things. Make sure when you correct him for chewing on things that you give him a toy right away, and lots of praise.

Good Luck, and don't give up!