The "00" code appears when the POST (the power on self test routine in the system BIOS that runs every time the machine is rebooted) completes without discovering any errors. This is good.
However, POST doesn't run when the machine emerges from a sleep condition. Instead, the BIOS just performs a simple check to see if the machine state, as preserved to either memory (S3) or disk (S4), was properly recovered. 30 indicates a successful recovery. It is a good thing, too.
Thank you very much, now I won't worry anymore! Haha