This is a situation that happens when your lower brain, your subconscious (or in reality your amygdala) feels overwhelmed or threatened, in fear of danger. When this happens, it takes over and uses all available energy resources to control the body and brain for its protection. That being said it is not always right. When it goes into safe mode, it will prevent you from conquering your challenges, fears, and at times, success goals that it feels may be dangerous.