My 02 Neon occasionally did it - more in hot weather.
(While it was under warranty the dealer had several attempts to fix it - never did...)
From memory, I think the problem is that the sensor (in the roof lamp housing) was way too sensitive. There is an adjustment under the housing cover, but that didn't fix anything...)
According to the manual, if you lock the car with the remote three times, it disables the interior alarm - did that ever work? You guessed it...