[cerulean]

Our pup is just five months, and at 4 1/2 or so she started waking up in the middle of the night again (she had been sleeping through the night for a few weeks by this time...)

We figured out it was probably teething that was waking her up.
Of course, once we were awake, I had to go pee, myself !!! But she didn't always even want to go out.

The solution was to give her something for the teething, like ice cubes or frozen fruit.