how cold does it get in youre area? the air might be dry (i have heard of using humidifiers to help with night time coughing), you could have washed or treated youre bedspread or his sleeping area with something that might make him cough,
The obvious would be kennel cough.... what does the cough sound like? like he is trying to hack something up or like something is caught in his throat???? (when toby had kennel cough he did it mostly at night, and in the day time he was more or less fine with only one or two coughing incidents during the day..... but when nighttime came he would cough ALL NIGHT) |