If you've been lucky enough to get upgraded to C, then the BEST solution is the SQ Lounge in T2. Reached easily by moving walkway.....Since you're 1K, you could try and get in at that time of nite by asking "nicely" tho this lounge is NOT a *Gold.......

I've had some success when they weren't real busy, and the place has food, drink, some "napping" rooms, and generally anything you'd want for the short turnaround. OTOH: My personal pref is to grab a cab into SIN and have some of their great hawker food....
Remember tho, that if you do exit security/immigration, you can't get back in until AFTER the ticket desks open. So just be aware of what time that is...(Unless you've been luck enough to have an onward BP)

To each their own....Have fun on your MR, and Best wishes, Dave