Hibernation Sleep State Until Reactivated

Forgive my apparent ignorance about this, but I've posted in recent months about my machine waking up on its own while in Hibernation. However, it only happened seldomly --ninety to ninety-five percent of the time it just stayed in its Hibernation sleep state until I reactivated it. Well, that's no longer the case --it's waking up on its own more frequently, and for that reason is beginning to make me a bit suspicious. I should add here that my machine was attacked twice in the last week from an IP Address in China --my firewall intercepted it, and I did a search on the address and saw that a number of people here have been reporting and complaining about that same individual. So my question is this: to what extent does my firewall protect my machine when it's in Hibernation, and can it be woken up by a nosy guy in China that's trying to hack into peoples' machines here in the States?