Cardiopulmonary resuscitation is a first aid technique for individuals in cardiac arrest that involves

is an emergency procedure that combines chest compression's mostly often with artificial ventilation in an effort to manually keep and preserve intact brain function until further measures are taken to restore blood circulation and breathing in a person who is in cardiac arrest.

Probably because you wake up early. even when i get a good nights sleep i still feel tired if i wake up early. or maybe you just need coffee.