There are three types of apnea. Obstructive apnea is secondary to upper airway obstruction.
Central apnea is associated with cessation of all respiratory movements.
Mixed apneas have both central and obstructive components. BMI is calculated by dividing a person's weight in kg by the person's height in meters squared. A biological rhythm that has a period length of about 24 hours. An episodic disorder of arousal, partial arousal, or sleep stage transition that manifests as abnormal movement or behavior during sleep, such as sleepwalking, sleep terrors, and REM sleep behavior, not a dyssomnia. Physiologic process characterized by a reduction of alertness associated with specific brain activity and eye movement patterns.