Yea heat Matts are a huge no no they can burn the underneath of your beardy as they can't feel the heat when it gets to warm and just stay there.
I honestly Wouldn't worry about night-time temps aslong as it's not absolutely freezing in your house there from the desert and deserts are cold at night time.
1.0.0 Bearded Dragon Called 'Che'
0.2.0 Leopard Gecko's That have no names... Just know as 'The Girls'
0.1.0 Normal Ball Python Called 'Amica'
1.0.0 BEL (Super Fire) Called 'Heisenberg'