I am obviously in no way in a position to advise anyone on anything, except how to keep feeding and training and adoring a dog that in public behaves like a gremlin post-midnight, rather than wrapping him in brown paper and posting him to bloody Battersea, but I think in your situation I might be writing a bit of a list of the things that make V more and less settled to try to work out what's needed.
I was just reading something that says sleep disturbances are really common in adolescence. Bill is still sleeping through the night, but he's in the bed with me. I've found he's really struggling in the daytime, especially the mornings, but if I take him up to the bed I can draw the blinds and put brown noise on, and he will reluctantly nap so I can work.
In your situation I might be thinking about where and when Vinnie can sleep in the daytime, what might be waking him up, whether there is too much light, or noise, or a draft in your bedroom, and that's why he gets unsettled, what is there about the living room that allows him to sleep as long as someone's on the sofa, etc. etc. If there are wooden floors upstairs, does that mean it's chilly on the floor where his bed is? Would a rug and extra blankets help, or a (lukewarm) hot water bottle? Is he maybe too hot, as adolescents apparently do run hot?
I would personally be really wary about letting him struggle on his own - adolescence is such a sensitive time, and it does seem that boys have bigger dips in confidence than girls - but your mileage may vary of course and he might be absolutely fine.