Here is the scenario:
I have a flight from SIN-BKK arriving at 11pm. I will leave from BKK-HKG at 8.00am on the same day. Here's a list of options to spend my time. I don't know if any are feasible and would like your help:

1. Find a lounge / hotel within the airport and stay there till checkin time. Are there some available?
2. Leave my luggage at the airport and venture out for something to eat. Are there lockers available? Any recommendations on where to go? I will be arriving on a Tuesday.
3. Get a room near the airport and stay there until check in time. Does the airport open 24 hours? Are there any good hotels near the airport?

Any other recommendations are welcomed.