Jon woke up the next morning, with no clue that the product of his wish (a floating magical cloud) had already roamed around town and changed many people.
Since the cloud was created by the magic of the stone, it had the ability to change reality (within the same range as the stone, of course) and it used that ability when changing the people it came in contact with. Since the cloud did most of its work overnight, most of the people changed by it were sleeping at the time and wouldn't notice anything different until they woke up.
The cloud changed their lifestyle to something completely different. All of reality had also changed around them - their environment, their family, their friends, their occupation ... all to match their new lifestyle. But the cloud kept their memories intact, so that they would always remember the reality before they were changed. It made things more ... interesting.
Jon stretched his arms, not knowing any of this. He would, however, notice any of the changes caused by the cloud, since the cloud itself was created by Jon's wish.
