Power saving mechanism for a wireless personal area network (WPAN) end device, e.g. a ZigBee end device; a sleep state and an active state for the WPAN end device are presented and the end device transitions to the sleep state after successful pairing with a WPAN coordinator; after a certain time period the end device moves to the active state and checks whether the WPAN is active (i.e. whether the WPAN coordinator is active); if yes, the end device polls the coordinator to receive a command if pending in the coordinator's queue