bd health

Question
my bd is 8 months old and usually really lively, but at the moment he seems to keep at the cooler end of the tank and also his head has gone a dull colour compared to his body. is this normal oris my bd ill.

Answer
 With the changes in weather, keep an eye on the temperature in the tank with a good digital thermometer.  Also, if you haven't had him seen by a good reptile vet yet for a check-up, a fecal would rule out tummy trouble.  Overall, the dull color is from skin lifting and he is going to shed.