Do you shake your legs a lot during the day? There are other things, disorders—-like restless leg syndrome (a misnomer, btw, it can present anywhere in the body, and sometimes doesn’t present physically except when trying to sleep), for example—-that can cause poor sleep.

So, it seems to me your best bet is to do the study because they’d find (or rule out) non-apnea causes, as well, but I understand the cost concern.