Obstructive Sleep Apnea (OSA): Characterized by repeated episodes of partial or complete blockage of the upper airway during sleep. Central Sleep Apnea (CSA): Involves intermittent lapses in breathing due to lack of respiratory effort. Narcolepsy: A chronic sleep disorder characterized by overwhelming daytime drowsiness and sudden attacks of sleep. Periodic Limb Movement Disorder (PLMD): Involves repetitive cramping or jerking of the legs during sleep. REM Sleep Behavior Disorder (RBD): Characterized by the acting out of dreams during REM sleep.