Having a covered crate worked wonders for me at least. My dog hasn't ever really barked at nights, but he used to whine if he saw me walking in my room and I didn't pay any attention to him (his crate is in my bedroom and he usually goes to sleep before I do). I haven't heard a sound from him since I started putting a blanket over his crate at nights.
I can't however leave the blanket on his crate at daytime when he has to be alone, he does drag it into his cage and starts chewing on it if he's not tired enough. But at nights there's never been a problem, I know he's always too tired then to have any energy left for that.
I can't however leave the blanket on his crate at daytime when he has to be alone, he does drag it into his cage and starts chewing on it if he's not tired enough. But at nights there's never been a problem, I know he's always too tired then to have any energy left for that.