I got a new Crested Gecko today and put it into his tank. The tank has moss mats on the bottom and they have water on them, anyways so this little guy was sleeping for about 5 hours on the wet and cold mats. He just woke up and I took him out to see how he is doing, when I did he felt very cold. Should I leave a light over his cage overnight so he can warm up and then he can move down or to the other side if it gets too hot? Can I just leave the light on 24/7 and have him just hide when he needs to?