Hi I have 2 sulcata tortoises that are almost 2 years old, they never use to do this, but now they are pacing back and forth in their enclosure. They are separated so I have 2 75 gallon tanks I have the hot side between 90-95 depending on the day, cool side between 78-80, in the middle it's usually 82-84. I am using 160 watt mega Ray UVB and 75 watt basking light due due cold weather out here in Northern California definitely not there environment, on the cool side I use a red exo terra 150 watt for one and 100 watt for the the other due to the location of the room. One area is more warm than the other. I've never really had an issue, but lately they would wake me up at a certain time 1 hour before I would turn their lights on, so at night I have a heater going on to bring up the temperature otherwise the temp. will go down the 70s which I am not comfortable with but the warm side at night is usually 80-82 and the cool side would go down to at least 73 sometimes depending if I leave the door open a little bit. Sorry for the long thread but they are becoming restless and I am thing they need a bigger enclosure. They are approximately 9 1/2 to 10 inches in length not sure about weight currently I do not have a scale.