Dr. Yong Poovorawan explains Brugada Syndrome ("ใหลตาย"), a genetic cardiac electrical disorder that can cause sudden death even in apparently healthy individuals, especially during sleep. Affecting 1 in 500–1,000 people in Southeast Asia (particularly Thailand's North and Northeast), the condition is triggered by high fever, alcohol, or genetic mutations in the SCN5A gene. Early ECG screening and lifestyle modifications can reduce risk; treatment includes implantable defibrillators and radiofrequency ablation.