5.016003 at d:/Users/lanx/pm/core_sleep.pl line 1.
CODE(0x328420) at d:/Users/lanx/pm/core_sleep.pl line 4.
CODE(0x349718) at d:/Users/lanx/pm/core_sleep.pl line 5.  <-- different!
Undefined subroutine &CORE::GLOBAL::sleep called at d:/Users/lanx/pm/core_sleep.pl line 7.