Cut and paste this URL to share the unmodified register and value:
https://regviz.com/r/stm32/stm32wb0/STM32WB05/WAKEUP_REG/CM0_WAKEUP_TIME#0x0
CM0_WAKEUP_TIME register
programmed wakeup time for CPU.
https://github.com/modm-io/cmsis-svd-stm32