I have sleep apnea, and what you described is what I experienced. I had a sleep study; abnormal sleep apnea is 5 or more incidences during the night, according to my neuro, who is also a sleep specialsit. I had 98
I now use a CPAP machine, and even though I still have periodic limb movements, I don't awaken the way you describe any longer. I get better sleep, too.