Some people (usually those with so-called subclinical sleep-disordered breathing or those with mild-to-moderate-OSA ) are bothered when they happen. Others (usually the moderate-to-severe) ain't, since they have apparently adapted to sleep right through them. ResMed machines are designed to react to them in order to head off hypopneas and apneas, but their modern home-treatment machines do not report them to patients as part of the AHI-trending numbers. OSCAR flags them, since it is helpful info for some.
Titrating CPAP to eliminate flow limitation may be associated with improved clinical outcomes compared to treating apneas and hypopneas. . . . The current system using apneas and hypopneas does not capture all individuals who may be suffering from clinically significant respiratory disturbances during sleep. Often the most challenging cases faced by sleep medicine clinicians are patients with “normal” PSG findings despite presenting with symptoms consistent with OSA. With improved diagnostic measures and understanding of IFL, opportunities for successful treatment may follow.--2015, "The role of flow limitation as an important diagnostic tool and clinical finding in mild sleep-disordered breathing," Nevin Arora, Gerard Meskill, and Christian Guilleminault. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4688581/