I have pretty big doubts about the usefulness of clinical sleep tests after having had one a few years ago. Perhaps they work well for very deep and immediate sleepers. But with the electrodes, a strange location, multiple interruptions, a sleep position I never sleep in, etc, it was probably one of the worst nights of sleep in my life. The doctor seemed to disregard all of that and treat it as my typical night sleep and based the treatment recommendations on it, which is when I realized I needed to seek help elsewhere. I've found other methods like Fitbit come closer to reality since they record the data under normal sleep conditions.