Hello,
No one can help you if you are not concise. What do you mean by "stuck in this condition"? There is no loop in HAL_PWR_EnterSLEEPMode().
What board are you using? Did you try this example https://github.com/STMicroelectronics/STM32CubeL0/tree/master/Projects/NUCLEO-L053R8/Examples/PWR/PWR_SLEEP ?
To give better visibility on the answered topics, please click on "Accept as Solution" on the reply which solved your issue or answered your question.
PS:
1 - This is NOT an online support (https://ols.st.com) but a collaborative space.
2 - Please be polite in your reply. Otherwise, it will be reported as inappropriate and you will be permanently blacklisted from my help.
