As previously noted, we get fair chunk of night time meowing which we find best to ignore -- Timmy isn't really stuck at the bottom of the well again, rather the boys either suddenly can't find the bedroom or are not so suddenly just bored.
However, when I put away the kitty treats last night, Whitey snuck into the closet before I could close the door, and I failed to check that it was empty.
Around 4 AM, a soft mew woke up me twice, and after the second time I realized it sounded too persistent and too far away to be a normal bored Whitey meow. I got up and looked around. Knowing he's been closed up before, I checked my closet first, and a relieved Whitey popped out.
Both he and my closet seem no worse for the experience.
And no, he didn't raid the treats, they go on a high shelf, inaccessible to even our acrocats