Please, if you have this many concerns about sleep apnea, go get a sleep study done.

Possibly. At the very least, you may experience was is called 'hypopnea', which is one of the components in the AHI or the 'apnea/hypopnea index'. AHI is what the medical field uses to establish one's need for intervention. If the count is higher than 5 events per hour, or in any one hour, it could indicate a need for PAP use.

As the person who just replied to you has suggested, the gold standard is an over-night sleep lab, the procedure called a 'polysomnography', where you get a gajillion electric leads placed all over your body, including onto your scalp and legs, and you try to sleep so that you can be monitored. I developed atrial fibrillation (AF) and it was the last diagnostic step proposed by my cardiologist. The result was 'severe sleep apnea', which is when one had 30 events each hour or more. I was counted at 31 events.

I know Sleepscore is not a diagnostic tool but would scores about 75 indicate low chance of apnea? What is deep sleep and rem sleep is very high?