In a 6-night stay some years ago at the Westin Ottawa (Rideau Pl.), the fire alarm went off precisely every other night at about 2AM. I believe the cause was reported to be defective components or circuitry and not a wayward guest. My bill was voluntarily adjusted by the hotel to comp every other night's stay. My mistake was in not bailing after the second false alarm. Although comp nights are good, sleep deprivation is not. I have not returned.