Cut and paste this URL to share the unmodified register and value:
https://regviz.com/r/stm32/stm32wb0/STM32WB06/WAKEUP/CM0_SLEEP_REQUEST_MODE#0x0
CM0_SLEEP_REQUEST_MODE register
CPU wakeup enable:
CPU sleeping control:
https://github.com/modm-io/cmsis-svd-stm32