Bearded Dragons are cold-blooded reptiles, which means they take on the temperature of their surroundings instead of generating heat themselves. This is why you'll see them sunning themselves in hot areas or just sitting around if it's cool. In captivity, Bearded Dragons should be kept at a comfortable 82-86 degrees Fahrenheit (28-30 degrees celsius) with a basking area of about 90 degrees Fahrenheit (32 degrees Celsius). They should always have access to water and shaded areas and a heat lamp to bask under if they need it.