Can someone recommend a sleep specialist here in BKK? And a hospital that does a polysomnography test, since I will probably need one of those? I usually go to St. Louis, but I don't see PSGs offered there.

Bangkok Hospital does PSGs.

http://www.bangkokhospital.com/treatment/Sleep-Disorder/

good luck

Bumrungrad

1 night sleep lab is around 20.000, including doctor's fees

Bangkok Christian hosp on Silom has a Sleep Clinic, pretty sure they do it too.

The specialist is there Wensdays 4:30 - 6:30 PM.

I finally got around to having a PSG and did it at St. Louis Hospital. Cost was ฿11,000 or about $337. By now it's clear to me that whenever I can get a test done at St. Louis it will be cheaper to do it there than at the other top-level private hospitals in BKK.

By comparison here's a study of costs for a PSG in the New York area that found prices varied from $600 to $6,177.

http://clearhealthcosts.com/blog/2013/04/how-much-does-a-sleep-study-cost-well-600-or-5070/

From an American perspective at least, prices in BKK for medical services seem very cheap indeed.