I agree..I have definitely noticed that a nighttime drop in temp increases daytime activity...if I keep my snakes too warm at night, they don't come out during the day. The girls are in a bigger enclosure tonight...I usually use a 25 watt flukers blue bulb at night...but tonight I am trying a 40 watt red bulb...will see how this works for them. I have been experimenting with an UTH as well...but don't have a themostat yet so I am not leaving it on at night yet.