 People with sleep apnea experience reduced or no slow-wave sleep and spend less time in REM sleep.Despite this medical consensus, the variety of apneic events (e.g., hypopnea vs apnea, central vs obstructive), the variability of patients' physiologies, and the inherent shortcomings and variability of equipment and methods, this field is subject to debate.Within this context, the definition of an event depends on several factors (e.g., patient's age) and account for this variability through a multi-criteria decision rule described in several, sometimes conflicting, guidelines.