hey carly!
I just had one of these done too a few weeks ago with my lowest pulse ox while sleeping being 80. Your numbers aren't too bad, but I was told that if you fall below 88 at any point, it's recommended that you start some sort of oxygen therapy. With me falling down to 80 there was no question...my doc ordered me to start using 2 Liters of O2 at night. Since you fell below 88 for a significant amount of time, your doc might start you on low oxygen therapy at nighttime too. Now, if you do end up on oxygen and a few weeks later you still feel the same, I would call the doc again and see if he/she suggests a full-on sleep study to make sure you don't have sleep apnea. With a sleep study, they would monitor your pulse ox, heart rate, etc. and it's usually done in the hospital.
I'm also pretty sure that insurance companies don't generally cover oxygen unless you fall below 88, so your numbers shouldn't give you any trouble with that. I'm on medicare and so far my O2 has been covered pretty well *knock on wood*.