cpu can't go to slepp when gpiote event occured?

[Pupil]

The cpu can't goto sleep when gpiote port event occured,after about 1 second later,the cpu then goes to sleep well,

I use the code bellow to enter sleep mode.Is there any thing wrong ,why when the event occured,thc cpu is can't go to sleep as I wanted?I

__WFE;
__WFI;
__WFI;

[Kenneth]

Not sure what you are doing here, but typically you will have an infinite while() or for() loop in you main, e.g.:

int main(void)
{
    // Init
    
    for(;;)
    {
        // Process application code
        
        // Wait for an event.
        __WFE();
        // Clear the internal event register.
        __SEV();
        __WFE();
    }
}

[Pupil]

Thanks.

I changed my program's scheme,seems work good now