Hi,
if your observation isn't good enough for the doctors to start further investigations, or if your statement, that you cannot find a reasonable explanation for these symptoms occuring, isn't either, can you not get the doctors or one of them to watch your treatment, i.e. sitting the patient up?
Or else, do you know when the ward round is, you could just happen to be in the room just before they enter?
Or, do you have a Rehab Consultant or Specialist Geriatrician, who you could ask?
A benign essential tremor is not a diagnosis, but a symptom. I mean, Parkinsons' could be the underlying cause and then your stuffed with even the best Physio efforts!
So, you have got all reason to ask for thorough investigation.
Regards,
Fyzzio