I will be arriving in Hong Kong at 4.30am on 13 July 2014. I need to go to Sheraton Macao Hotel,

You mean you will reach HK during the wee hours?

If so, you cannot take the direct ferry from HKIA to Macao. You need to local public bus line N11 to Central (Macau Ferry) Station and then walk to the ferry terminal to take a ferry for Macao Maritime Ferry Terminal, where you can find the free shuttle buses of the Sheraton. You can take the free shuttle buses to reach your hotel.

The ferry's ticket fare is around 195HKD per adult at night.