Brand new and properly functioning smoke detectors/smoke alarms do get false trips. Insects, high humidity creating condensation in the sensing chamber, dust, or even the occasional random electronic noise can all create a false trip. Early morning _and_ adjacent to a kitchen. 90% likely to be moisture condensing in the sensing chamber. The moisture gets in there from cooking, dishwasher operation, etc. then when the temperature and humidity hits the right point late at night, The moisture condenses in the sensing mechanisim. Unless it becomes a regular occurance, it's the equivalent of a bug flying up your nose. Take some canned air to the detector and move on.
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