Any advice on what to do at Singapore Airport at 12 am to 8am in a few weeks. Open to bars , sleep pods, looking around?

What about lounges at BKK (Suvarnabhumi Airport)? Any still open? Or did some genius Thai decision makers think that roaming freely around the airport would be less infectious? Due to limited domestic flights, I might have to spend 9 hours there before heading back to Europe. Arrival around 2pm, intercontinental flight around 11pm. Any other (quiet) places with a desk to get some work done? Novotel or something? Thank you.