The present disclosure relates to a method performed in a network node in a communication network. The method comprises receiving instructions to monitor whether a first service is sending a message intended for a radio device. The method also comprises monitoring the first service, in accordance with the received instructions, in order to obtain information relating to whether the service is sending a message intended for the radio device. The method also comprises processing the obtained information such that a decision can be made whether to wake up the radio device. The present disclosure also relates to a network node and to a radio device.