hi all, thanks for replying.
to be honest all the possible causes have been identified and efforts made to change, for example, quitting spicy foods, having a cool shower before bed, not eating before bed, reducing alcohol (a struggle). nothing seems to work. blood tests came back negative for anything being wrong. an acupuncturist seemed to think it was a blockage of the kidneys and herbs and treatment are somewhat of a last resort. the room is ventilated, so thats been ruled out, because of the same thing happening in hotel rooms on recent holidays. stress levels are only rising because of this, at times life before stress was much more prevalent and nothing ever happened. its just all so frustrating.