Proposed herein are a method for performing wireless communication by a first apparatus and an apparatus supporting the same. The method may include the steps of obtaining SL DRX configuration including information related to SL DRX active time of a second apparatus, determining a selection window, selecting at least one first candidate resource within the selection window based on sensing, selecting at least one second candidate resource within the SL DRX active time of the second apparatus, based on the at least one first candidate resource not being within the SL DRX active time of the second apparatus, selecting an SL resource from among the at least one first candidate resource and the at least one second candidate resource, transmitting first SCI, to the second apparatus, for scheduling a PSSCH and second SCI, through a PSCCH, based on the SL resource, and transmitting the second SCI and a MAC PDU to the second apparatus, through the PSSCH, based on the SL resource.