I know this doesn't seem like much. But ever since I got Home last night with Oscar from my Mum's at around 10PM. Oscar's been barking all night, on and off! I don't know what to do! :/ I don't think I've even had a full hour, or two hours sleep, without him getting up and barking

Does anyone know why he could be doing this?? It's 7AM where I live right now, so I can't have him doing this.