Thank you so much everyone, and thank you so much, Carrie! Below is the email that Carrie sent me. It's wonderful, as usual!

Carrie, I sent a reply to the email you sent me with a whole bunch more questions....did you get it? I hope so, but if not I can try to remember what I asked and re-send another email. Or maybe I can just post the questions here?

Again, thank you And by the way, wouldn't it figure, Graham hasen't barked at night time since I sent you the email...perhaps he read the email first and stopped barking in fear of having to be locked out of the bedroom!

Hello,
Thanks for emailing - I was starting to feel really left out!!! I don't know what is wrong with this machine but hopefully we will iron out the bugs and get back to normal soon!!

My guess is that Graham is using this behaviour as an attention grabber and to try and confirm and stabalise his place in the pack. By barking at stupid o' clock in the morning he can judge how quickly the rest of the pack respond to his lead and this will make him feel a lot better and more secure now that there is another creature in the house that speaks dog as well as he can. Graham thought he was the only one clever enough to do that and his idea of the world has been shaken and his position in it seems a lot less secure than it used to be.

I assume that Graham shares a room with you at night?
I'm pretty sure he does so will answer as though he does.

Prepare yourself for a couple of nights of less sleep before it gets better.

As soon as Graham starts to bark get up, take his collar and lead him out of the room. Shut the door and move away from the door. As soon as he is quiet allow him back in. It will soon dawn on him that leadership is not his thing and it is up to you how the pack behaves, not him. Do not speak or look at him while you do this or when you allow him back into the room.

It won't take long but it will seem like a long time!! It always does at four in the morning!!!!!

Good luck - please let me know how it goes,
Love Carrie