When you’re stressed your sympathetic system attempts to rapidly prepare you (both mentally and physically) for a “flight or fight” type situation. In evolutionary terms, your mental focus is much better spent on the imminent threat at hand (like a predator chasing you) rather than literally anything else not directly contributing to your immediate safety. This can often make one very forgetful in particularly stressful situations.
When you’re stressed your sympathetic system attempts to rapidly prepare you (both mentally and physically) for a “flight or fight” type situation. In evolutionary terms, your mental focus is much better spent on the imminent threat at hand (like a predator chasing you) rather than literally anything else not directly contributing to your immediate safety. This can often make one very forgetful in particularly stressful situations.