What is OSA . Repeat episodes of partial or complete upper airway obstruction during sleep Result in a disruption of normal ventilation and sleep patterns . Continuum of sleep disordered breathing . . Sleep in children . After 6 months REM sleep and non-REM sleep . REM sleep . Muscle atonia Increased cerebral blood flow Variable HR RR BPIncreased upper airway resistanceDuring REM get bursts of phasic events causing rapid eye movements and myoclonic twitches .