Sleep apnea is a type of breathing disorder that occurs during sleep
When you fall asleep your body relaxes and your upper airway can close partially-usually snoring, fully which is apnea
When it closes fully you stop breathing which causes blood OX to decrease to an unhealthy level and the brain to wake. Inject adrenalin into the bloodstream
Increases muscle tone so you can breath
Then you sleep, relax and the cycle starts over again
It is also a syndrome that continues to get worse with age