As long as you teach them not too.. they won't be too bad! Avie isn't a big barker.. of course she learned to bark from my moms doggies!
but she will really only bark if someone is at the front door or random times like that.. but she isnt a big barker and when we tell her to stop she does.. MOST of the time!
So as long as you are teaching your baby not to bark.. i don't think you will have a problem!(yorkies are VERY smart!!)
and we never had a problem with Avery sleeping through the night.. she has always slept with us, also! of course when we first got her.. she had her normal puppy training time.. so she would wake up a couple times and we just made sure to put her on her pad to go potty then she would go right back to bed!!
like i said before yorkies are VERY smart.. and of course, you will have the training/puppy stage but it isnt bad and will come pretty quickly, if you are consistent!!