Thailand - Any lounges open 1-6am at BKK

I'm flying through BKK on way to Samui arriving in bkk 1:30am on Qatar leaving to Samui at 6:00am..

How early can I check in with Bangkok air?

Are there any lounges open this time? anywhere I can pay to rest for a few hours? Any places in the airport that can provide a rest for a few hours?

Thanks

http://www.dayrooms-ciplounges.com/cip-lounge1.html

Louis Tavern lounges are open all night but they are in the international area and require an international BP which you won't possess. I believe the PG domestic transfer desk will also be closed when you arrive.

There is a food court on the first level at door 7 (streetside) that is open 24 hours. If you desire to stay in the airport until checking in this would be your best bet.

I know TG desks don't open until 5AM for their 6AM flight to UBP so I'm guessing that PG would have similar check in times for a 6AM domestic flight.

Thai Silk Lounge is open at that time.

UA always uses them in BKK

Thai Silk Lounge is open at that time.

UA always uses them in BKK

TG lounges close from 1-5AM. One lounge in the E concourse is open for the UA flight but this lounge re-opens between 4 and 5AM (IIRC).