Hi, i've been told that my house is too cold to turn off "Sullie's" heat bulb at night (it drops to around 15 degree - he's been very lathergic, sleepy and not eating/pooing through the day) so I've been advised to leave it on all the time and just turn his UV bulb off at night. I would still like to turn his temperature down slightly at night to simulate night time for him - does anyone know if you can buy some sort of temperaute gague which allowed you to change the temperature?