Are you kidding? With what we pay on LI for Electric, they have to get used to the dark!!! No really, they have no problem having no lights on. If we are out we come home to snoring doggies.
Dudley sleeps downstairs. I have a light in the front window on a timer, so that's on until midnight or 1 am...he's usually snoring up a storm before it turns the light off!