my beardie is doing this too...
check this out:
http://www.beardeddragon.org/articles/brumation/?page=1 it has a lot of great information here but honestly, IMO, the only thing to do is just go with the flow... thats what was suggested to me. i'm afraid i'll miss something and he will be sick as opposed to going into brumation but Phoenix has all the signs of brumation... barely eating, wont bask and sleeps off and on, and he has had a full vet visit and eveyrthing is clean, but i too am still a bit unsure about the process... i can read about it all day long but until i actually take part in or see whats going on i guess its hard for me to grab hold of the idea... anyways i hope this helps you, and maybe we can help eachother lol...
Jordan, Phoenix and Juuji