This is progress! A polysomnography, over night in a sleep lab, would have detected the limb movement because leg sensor straps are part of the hookups, of which there must be 20 or so. Brain function, breathing, oxygen levels, pulse, and a machine you breathe into that detects stoppages or shallow breathing where you don't get enough oxygen (hypopnea).

I hope I don't ruffle any feathers......but.....an O2 level below 90% begins to bear scrutiny, especially if you spend a total of 15-30 minutes at that level each night. Below 85% means there's a distinct problem leading to a desaturation (desat). If it happens several times each hour, or even twice a minute, this is a distinct problem that ought to be rectified....ASAP. I sincerely hope your limb movement issue resolves, AND THAT it helps a lot with your sleep quality. But, I wouldn't be the least bit surprised to find that it's just one of the two or three sleep problems that you have. If you continue to get desats each night, and if your REM sleep doesn't climb above 12% as a minimum, there's still something else that needs to be fixed.

Good luck!