"We don't sleep enough" is vague. But OECD's annual sleep statistics give us precise numbers. Korea ranks last among 38 OECD countries in average sleep time. Here's what those numbers mean and who is hit hardest.
Cross-country sleep comparison (adults)
| Country | Avg sleep | vs OECD avg |
|---|---|---|
| United States | 8h 51m | +29 min |
| Australia | 8h 32m | +10 min |
| France | 8h 33m | +11 min |
| Germany | 8h 18m | -4 min |
| OECD average | 8h 22m | — |
| Japan | 7h 22m | -60 min |
| Korea | 7h 41m | -41 min |
Korea is second-worst in the OECD after Japan. The 41-minute gap, multiplied across a week, equals 4 hours 47 minutes — roughly one full deep-sleep cycle's worth lost every week.
By age — the 50s are the worst
| Age | Avg sleep | Notes |
|---|---|---|
| 20s | 7h 32m | Smartphones, late-night socializing |
| 30s | 7h 18m | Childcare + late nights at work |
| 40s | 7h 14m | Management responsibility + parents |
| 50s | 7h 12m | Worst — menopause adds hormonal change |
| 60s | 7h 28m | Post-retirement recovery begins |
| 70+ | 7h 03m | Apnea, chronic pain, age-related |
The age groups that work the most — 30s to 50s — sleep the least. Sleep loss in old age is partly natural; in working age, it's social pressure.
By industry — who sleeps least
Average sleep time in the 2022 Korean labor ministry survey:
- Hospital staff: 6h 28m — night shifts and on-call
- IT / startups: 6h 35m — late nights and deadlines
- Broadcast / media: 6h 41m — irregular schedules
- Logistics / transport: 6h 45m — early starts, night driving
- Hospitality / dining: 6h 52m — late closes
- Finance: 7h 5m — market hours pressure
- Manufacturing: 7h 18m — high share of shift work
- Education: 7h 30m — relatively stable
- Public service: 7h 50m — best in country
Why Koreans don't sleep — 5 structural causes
- Long working hours: 1,872 hours/year, 5th in the OECD. 530 hours more than Germany.
- Hoesik culture: weekday-evening drinking + late return shifts bedtime later
- Hyper-academic society: average teen sleep is 6h 14m (less than adults), driven by college-entry pressure
- Urban environment: night noise, streetlights, dense housing make sleep environments worse
- Smartphone penetration: 95% smartphone penetration ranks #1 worldwide — screens until the moment of sleep are universal
Economic cost — sleep loss as a GDP drag
RAND Institute estimates that chronic sleep deprivation costs Korea about $11.3 billion in GDP yearly (about 14 trillion KRW), about $300 per person in invisible losses. Main causes:
- Lower work efficiency (concentration, decision-making)
- More sick days (URI, GI issues)
- Higher long-term medical costs (cardiovascular, diabetes, depression)
- Safety incidents (drowsy driving, industrial accidents)
The good news — change is possible
Korea's average in 2010 was 7h 22m. By 2020 it was 7h 41m — 19 more minutes over a decade. The 52-hour workweek law, work-life-balance shifts, and remote-work expansion are making small dents. The OECD gap remains substantial.
What individuals can do is limited, but if you control what you can — caffeine, bedroom environment, weekend pattern — you can sleep better than the statistical average.
Where do you stand?
Track your sleep for a week. 7h 41m means you're at the Korean average. Under 7h means below average — there's room. Over 8h means you're at the OECD upper end — well done.
But matching the average in a country with insufficient average sleep isn't a badge of honor. Aim for the OECD-recommended 7h 30m to 8h 30m range.
