We'll be flying into HKG from NRT in July at 10:00 PM and we need to get to Guangzhou.

Are there any buses that still operate from HKG to Guangzhou at that time after 10 PM? Is there a difference in time between buses that cross into the mainland at Shenzhen Bay and those at Huanggang? We want to go to Guangzhou by 2 am at the latest so we can get to our relative's place. Would that be possible or do you think it would be better if we book a cheap hotel in Hong Kong for the night and take a train from Hung Hom the next morning instead?