People tend to set up cages with ideal temperature gradients geared to day time temps. It's important drop the temps at night 5 or 6 degrees so that your snakes will cool off and be forced to thermoregulate every morning. Getting them moving around to do this will increase muscle tone, help with digestion-metabolism, shedding,... overall well being. Otherwise, they find a comfortable little spot and become stagnant little hide potatos.