For Some individuals, sleep apnea is worse through REM sleep. A 2012 study inside the Journal of Clinical Sleep Medication analyzed 300 sleep reports and located that 50 percent of people had a 2x boost in AHI when in REM sleep. The TF acknowledges that there might be certain contexts https://www.refreshsleep.net/adult-and-child-sleep-clinic-our-services/restless-leg-syndrome