Brumation
Brumation, also known as the "shutdown period" is commonly regarded as a state of extended "sleep" for reptiles and is often equated to hibernation of warm-blooded animals. However, the two sleep states are not one and the same. Unlike hibernation the dragon may appear to be 'resting' and not in a constant sleep state. Therefore you will notice that they often have their eyes open and are watchful of activity, yet they will not exit their hiding area. Brumation is basically the survival mode of cold-blooded animals in their natural habitats when the weather becomes too cold for them to maintain higher body temperatures and thus properly digest food. Typically, in their natural environment bearded dragons will brumate in late fall when the weather begins to cool and the days get shorter. Reptiles in captivity will also seek to brumate as this state is "hard wired" into their system and it will generally occur after their first year but may occur sooner. During brumation it is normal for dragons to become inactive, abstain from feeding and seldom come out of their hiding spot for several weeks or several months depending on the dragon. Each dragon is individual and there are many variances in their brumation cycles. When a dragon seeks to brumate, which is often indicated by slowed eating habits, decreased activity and continual hiding, the enclosure conditions will need to be adjusted to simulate the natural conditions associated with this state. Lighting should be gradually decreased to be on for 8 hours per day and off for 16. The enclosure temperature should be adjusted within the 15-21 degree Celsius range (60-70 Fahrenheit) and the basking area temperature should be lowered to within the 23-26 degree Celsius range (75-80 Fahrenheit). Although it is difficult at the start to leave your dragon alone 'sleeping' for so long we do urge you to resist the temptation of waking them up, as this state is conducive to their continuing health.