When I went back to Việt Nam the first time I stayed in people’s houses, not in hotels. They were prosperous folks and had well made bedsteads. What they didn’t have were mattresses so they were like sleeping tables. I figured I could put up with those as I had done okay on the ground when I went camping as a young adult. What I found is that I went to sleep very quickly and woke up 4 to 4 1/2 hours later wide awake and alert and feeling good about 4 AM and stayed alert through the day to late at night late at night and did not need to take a siesta as everyone else did in the hottest part of the day. After I had been back for a while I noticed that I did not sleep well and woke up with a headache as often as not. I finally constructed a bed that was the equivalent of those I had experienced over there but not as aesthetic. Since then I have pretty much replicated the experience in Việt Nam. I am older and creakier and sleep longer now, 5-6 hours but I wake up AWAKE and no headache. I wish I had done that many years ago.
I believe I am too thin to sleep on a uncushioned table. My hips and shoulders would scream with pain.