There might be something wrong with your enclosure. Could you give a description of the cage or just post a picture?
it stays at the bottom? then i beleive it is temperature issues. heat is less dense than cold air. so hot air travels up. too humid? too hot? It is mostly your husbandry. What i need to know is your: 1. temperature 2. humidity 3. if you have more plants on the bottom than the top 4. is it eating regularly 5. has it been less active? ~* like plamars said. it would really help if we got a picture of your enclosure, so we know if you have substrate, too much humidity, plant abundance.... etc. A picture would really help.
