DISCLAIMER: I would never actually do something like this to my Dog. I love him 
BUT. At 5am, every morning, without fail he starts howling and whining for no reason. I have tried everything, including letting him roam the kitchen at night, going down to let him out (he won't go), knackering him out at night and just going to see him. He will howl for about 5 minutes and then he stops, but it has started disturbing our neighbours and I don't want a complaint (Landlord owns both houses).
Any ideas?
So as not to drip feed, and although this isn't relevant, the neighbours are frequent drinkers and cause their own noise disturbances, waking us up at 2am screaming at each other and slamming doors at all hours (but that's a whole other thread).