My gorgeous nearly 7 month old shih tzu boy is such hard work in the evenings.
He sleeps through the night in my sons bedroom, 10pm until 7 ish. Never needs the toilet.
Good as gold with toileting, we have 40 minute walk every day, he has puzzle toys, kongs, he generally sleeps whilst I'm working at home, he's just mostly lovely in every way.
But the ongoing problem we've had for months is he won't settle in the evenings. He gets overtired and if I'm busy in the kitchen, etc he will settle then follow me so doesn't just relax and sleep which he really needs. Wont go in the crate hasn't for ages and we don't have a penned off area but he has a dog bed that he loves. He's anxious without me I think and when he's over tired his behaviour is exhausting, nipping jumping and barking. I do ignore this behaviour but I start to get anxious each evening thinking its going to be stressful.