The noise means that you should take the vehicle to the Nissan dealership for free repair under the terms of the various warranties that should still be in effect on a 1 year old vehicle with only 28k miles on the odometer.
Do not even attempt to provide the dealership with a diagnosis, as they will undoubtedly reject your diagnosis. Just provide as much information as possible, including playing a recording of the noise for them, and describing the conditions under which you hear the noise. If you can have the car parked in their lot overnight, and if you can demonstrate the noise in the morning for a mechanic, that will help them to diagnose the problem properly.