That sounds like the way that the game normally operates when you first launch it. At launch, the game determines what should have happened during the time that it was not actually running and updates the state of your game accordingly. The entries in the log display certain sequential calculations that the game is performing when updating the game state. While the log doesn't contain everything that the game is updating, it does provide enough information to determine what happened to your game(s) overnight. The time stamps in the log are from the system clock at the time you launched the game and are all within a very short span of time, because the process of updating the game state doesn't take long.
One of the hazards of leaving the game running on the faster speeds overnight (or any long period of time when the game is unattended), especially in the beginning stages of the game, is that an Island Event can occur while the game is off. Since you don't see the event until you launch the game, you are unable to respond to it and minimize any detrimental effects that it may have had on your villagers. What you saw in the log represents what your villagers experienced overnight, which may have included the effects of those Island Events.
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Barbara
Unicorn
Last Day of Work