Safety First!
Fires often occur due to the cut-off feature that is built into modern hair dryers that makes it automatically turn off when it reaches a certain temperature. If the hair dryer is then put down without being switched off at the socket, it will re-activate as it cools down, often in an empty room. This heat can cause scorching damage to materials such as carpets and bedding and even set them on fire. Using a holder to safely store a hair dryer will prevent damage even if it does start up unexpectedly, although switching it off at the mains when not in use is always recommended.