In which case you need to leave him the hell alone. It varies from Dragon to Dragon but some go into full on dormancy (constant sleeping) while others have just a lower level of activity. You need to read up on Brumation I think.
QB
Here is the relavent info from Beautiful Dragons.com. Sorry, I could not find a way to get a link direct to it.
Brumation is like hibernation, but the Beardie's body doesn't completely shut down. Brumation is largely a result of temperature and light changes when the days get shorter and nights get longer. In captivity, you may keep your Beardie's enclosure fairly consistent as far as temperature and light go and his activity levels will stay the same. However, your Beardie's internal clock might just tell him it's time to brumate, regardless of what you do.
Generally, brumation occurs in the fall or winter. Your Beardie will likely become less active and eat less (or stop eating all together!) If your beardie decides to brumate, he may sleep for weeks or months at a time or he may just be lethargic for a while. Also, a brumating dragon may dig under his substrate, hide under something or just lay around his tank. I continue to provide veggies and occasional mealworms just in case they want to snack. That's another reason to provide a basking site so they can digest if they decide to eat. Even without eating, Beardies don't lose weight while brumating normally.
There are many theories on what to do when and if your Beardie decides to brumate. Some owners think that forcing brumation by lowering temperatures and light to simulate winter is the way to go while others try to hinder it. Personally, I feel it is best to let your bearded dragon do whatever comes naturally!
If you think your Beardie is about to brumate or is brumating, make sure he is healthy. Have a vet perform a fecal exam to check for parasites. If the dragon is healthy, he will likely brumate for extended periods without any problems. Continue to offer food and water, but don't force it. You may lower the temperature a bit in his tank, but continue to offer a basking site in case he wants it. If your Beardie decides to eat something he will need the heat for digestion. Monitor your Beardie's weight and check for dehydration during brumation. If you lightly pinch the skin on the back of your Beardie and it goes right back down, your beardie is not dehydrated. On the other hand, if the pinched skin stays in place for a few moments and slowly goes back into place, your beardie needs water. Surprisingly, most dragons won't lose much weight or become dehydrated even after brumating for a few months. If you are concerned about dehydration, give your dragon a warm soak once a week. The rest is up to your Beardie!
Above all, use common sense. If your dragon begins to lose weight, develops smelly/runny stools, or has dark circles under his eyes, consult a vet immediately, as these are often signs of dehydration and/or parasites.
