Apparatus, methods, and computer-readable media for facilitating serving aperiodic traffic over sidelink using resource adaptation of periodic resource reservations are disclosed herein. An example method for wireless communication at a first device includes reserving periodic resources for sidelink transmission. The example method also includes modifying the reserved periodic resources within a period based on a traffic load for the period. The example method also includes transmitting sidelink communication in the period based on the modified periodic resources. Another example method of wireless communication at a wireless device includes receiving a periodic resource reservation for sidelink transmission. The example method also includes receiving a modification of the periodic resource reservation for a period. Further, the example method includes transmitting or receiving sidelink communication in the period based on a modified periodic resource.