Gaining the Rested buff requires the Resting status for an uninterrupted period of time (approximately 20 seconds). While you maintain Resting, you can move to a zone of higher comfort to automatically extend the duration of your Rested buff.

Sleeping in a bed does not automatically apply the Rested buff, but the time spent sleeping does count against the required Resting time. The benefit of the Dragon Bed is that it provides 2 comfort where a basic bed provides only 1. Please note that you do not need to sleep in the Dragon Bed to take advantage of its comfort value (i.e. someone sleeping in a basic bed near a Dragon Bed enjoys the better bed's comfort).