Turns out that just after midnight, hours after I wondered if Logan was really sick or not, he woke up with a full pull up of some really disgusting stuff. The pull up was so full, that it did not actually....uuuuhhhhhhh.......contain?.....everything. He was a mess up the front and back of his skinny little 4 year old body and since I had just put clean sheets his bed, they, of course, were hit as well.
When we moved into our new house, I insisted that AgentAnime install on of those hand held/removable shower heads in the boys bathroom for times like this. For times when nothing short of a fire hose would do the job. I got him scrubbed down and hosed off and bravely allowed him to sleep on my bed. The rest of the night (not that there was much left of it) was uneventful, and he had a few more "instances" of "unpleasantness" that day, but nothing we could handle!
He had a pretty good week and only complained about not feeling well around bedtime, so I suspect he was just tired those times.
Thank you all for your kind words and thoughts about my little buddy!