Mental Health Columnist
Dr. Emily Park is a clinical psychologist specializing in sleep research and stress management. She earned her PhD from Stanford University and has published extensively on the intersection of sleep quality and mental health outcomes.
Hwabyeong was once listed in the DSM-IV-TR's glossary of culture-bound syndromes and dropped from DSM-5 in 2013 — not because the condition was debunked, but because psychiatry changed how it classifies culture and distress. Decades of Korean clinical research describe a real, measurable symptom cluster tied to suppressed anger and chronic interpersonal strain.
Autopsy studies have repeatedly found people who died with the brain pathology of advanced Alzheimer's disease but who never developed dementia in life. The variable that protected them is now well characterized — and largely modifiable.
The 2010 Holt-Lunstad meta-analysis estimated that social isolation increased mortality risk by roughly the same magnitude as smoking 15 cigarettes per day. The number has held up across replications, and most public health frameworks still do not treat it with that gravity.
The cortisol curve in modern populations does not look like the textbook diagram. Decades of HPA axis research show specific patterns of dysregulation that connect chronic stress to metabolic, immune, and cognitive outcomes — and most of them are reversible if caught early.
They're often used interchangeably, but mindfulness and meditation are distinct practices with different neural mechanisms, different evidence bases, and different optimal use cases.
Understanding the architecture of sleep — from light NREM stages to vivid REM periods — reveals why alarm timing matters more than total hours in bed.