Um, my experience yorkies are very much lap dogs and very attached to their owners.  Would you leave a baby alone downstairs?  I wouldn't, but then again I couldn't handle crate training him b/c he would pee in there and then pretty much roll the crate to get free.  Sooo.  I would recommend keeping him in a crate closer to you.  Or um sleep in a bed in your room.  What do you have against keeping him with people?     
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