At 3 or 4am, like all dogs and children do.
It seems he had good reason - a somewhat large chunk of re-hydrated chicken breast, apparently too big to pass or digest. When he came back to bed, he curled up by my chest - usually he hangs out by our feet - so I knew he needed some more comfort/snuggles.
But, even if he had a reason, that didn't mean I wasn't completely freaked out. I spent the rest of the..well, morning curled up around him, half-dozing and debating whether or not to stay home or take him to work with me.
His appetite was perfectly fine this morning and so was his energy level. So he's fine. I just worry.