Very strange. I've had my daughter's toys make noise on their own. It usually happens when the batteries are running low. If they were from the same kitchen set, that could explain it.
The one you have the best chance of explaining is the light. What you need to do is get your heard right where the light is, even if you have to stand on a ladder. Try and intercept the source of the light with your eye. If that doesn't work, get a piece of cardboard and hold it up to the spot. Make sure the spot on the wall is gone. Now move the cardboard in various directions to see when the spot comes back and when it's gone. You should be able to chase it to its source.
Other than that, do like they do in the movies and find out if anyone was murdered in your house :>
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