Stalker V2 Sleep Library

Could you, please, explain, how to use these sleep functions? As a beginner seems like I’m missing something.

When I run “powersaver.pde” sketch, in Serial monitor it prints a line with current time and another line “Sleeping”, but that’s it, my Stalker doesn’t wake up after that even if I specify “EverySecond” for RTC.enableINTA_Interrupts(). I tried running that sketch on external power too.

Do I need to do something on the hardware side to wake up it up?