Its never a good idea to leave things of this nature un-attended, candle warmers, steamers, potpourri pots, etc., most are made very cheaply, "Trust" I wouldn't.
Most likely the battery is flat. Have you left the radio or any lights on overnight?
no
They may be unsafe to eat if left out overnight and should be thrown out.
does squash spoil if left overnight or two days
No if the candle not lit it probably won't melt
No. It is not safe to eat turkey left out overnight in any container.
No, it may not be safe to eat after being left out overnight.
Wax.
No. Stew left out overnight would not be safe to eat, covered or not - unless where it was left out was as cold as a refrigerator.
No.
It wouldn't be safe to eat salad that's been left out overnight.
No, it is not safe to eat if it has been left out overnight.