Is Your Sleep Normal?

Sleep Around the World: Are We Getting Enough?

A Global Sleep Crisis

The world sleeps an average of 7.1 hours per night — below the 7-9 hours recommended by most health organizations. The WHO classifies insufficient sleep as a global public health epidemic. Two-thirds of adults in developed countries consistently fail to get the recommended 8 hours. The consequences are not subtle.

The health effects of chronic sleep deprivation are extensive and well-documented: elevated cardiovascular risk, impaired immune function, increased cancer risk, metabolic disruption associated with type 2 diabetes, cognitive deficits across virtually every measured dimension, and mental health impacts indistinguishable from clinical depression in severe cases.

Japan and South Korea: The World's Most Sleep-Deprived Societies

Japan and South Korea consistently rank as the countries with the lowest average sleep time — around 6.3-6.5 hours per night. This isn't random. Both countries combine extreme commute times (often 90+ minutes each way in major cities), intense work cultures where leaving the office before one's boss is socially prohibited, academic pressure that starts early and runs late, and 24-hour urban environments with constant stimulation.

Japan has a specific cultural phenomenon around sleep deprivation: 'inemuri,' or sleeping in public spaces, exists precisely because everyone understands people aren't sleeping enough. It's socially acceptable to sleep on trains, in meetings, even at desks — because exhaustion is evidence of dedication rather than laziness.

New Zealand and Scandinavia: Sleeping Best

New Zealand, Finland, the Netherlands, and Belgium consistently report the highest average sleep times — 7.3-7.5 hours. These countries share several features: shorter average commute times, strong work-life separation enforced by both law and culture, high rates of physical outdoor activity, and genuine social resistance to overwork as a status symbol.

Nordic countries in particular benefit from labor policies that actively protect rest: strict limits on working hours, generous vacation time, and cultural norms where leaving work on time is respected rather than penalized. The concept that time away from work makes work better — not worse — is more institutionalized in these societies.

The Science of Better Sleep

Sleep quality is as important as quantity. Deep sleep (slow-wave) and REM sleep serve distinct functions — cellular repair and memory consolidation respectively — and are disrupted by different things. Alcohol, despite causing drowsiness, suppresses REM sleep. Blue light disrupts the timing of sleep onset but not necessarily depth once asleep.

The most robustly evidence-based intervention for sleep quality is regularity: going to bed and waking at the same time every day, including weekends, stabilizes your circadian rhythm better than any supplement or gadget. After that, cooler room temperature, darkness, and pre-sleep routines that signal wind-down produce consistent improvements.