OK, so he's 9 weeks old and a poppet during the day. Ticks all the boxes re: temperament, doing well on the house-training front (all poos outside, wees hit-and-miss) and is well-socialised.
He's very attached to us and, as we've all been around since he arrived on Wednesday, has seldom been alone. This may be the problem.
He will settle for the first hour or two at night (in the kitchen) as he's exhausted, but then wakes and barks constantly - would happily do so for the whole night. The vet said to ignore him, but another vet (a friend) has suggested we go down to visit him, but keep it dull and to-the-point (toilet, make sure he's safe and comfortable, leave). We leave the radio on (maybe he doesn't like Classic FM?) and subdued lighting. I really don't want him upstairs with us for company, although I know he'd quieten like a shot, because he's as good as gold during the day when he's with us.
We're trying to leave him alone more during the day and praising him like mad when he's quiet or in his crate/bed, but it made no difference last night at all, worst night yet.
Any ideas, oh wise doggy people? DH back at work tomorrow, and kids have school exams. They need sleep.