ChaiFM

2026.07.15 – Dr Karl Kruszelnicki – Wednesday’s with Dr Karl 15.07.2026 6:34 ↓

1) Wired But Tired How can you be simultaneously tired yet wired – the paradoxical feeling of being physically exhausted but mentally unable to switch off? Blame your stone‑age brain. Your “human stress response” evolved to respond to short-term immediate threats (such as a lion) – not to an overflowing email inbox. When the brain detects threat, a region called the amygdala initiates the body’s c...