Sleep by City
How Sleep Varies by Where You Live
Real, sourced data on daylight swing, light pollution, and local sleep survey findings for major cities worldwide — not generic sleep advice with a city name swapped in. Every number here is either computed directly from the city's real coordinates or cited to a named source.
Calculate your own sleep debtUSA
From coast-to-coast time zones to 24-hour cities, sleep environment varies enormously across the US.
New York City
In Times Square, researchers studying artificial sky brightness found that at midnight you'd struggle to count…
Los Angeles
Los Angeles shows up on two separate real lists that turn out to be connected: cities with the worst fine-part…
Chicago
A 2024 study measuring real ambient decibel levels across major US cities ranked Chicago among the top 5 loude…
San Francisco
San Francisco presents a genuine data contradiction: one analysis ranks it among the top US cities for sleep, …
Miami
A 2024 study measuring real ambient decibel levels across major US cities found Miami had the highest average …
UK & Ireland
Long winter nights and short summer ones make circadian rhythm a bigger factor here than in most regions.
London
London sits far enough north that its daylight swings from under 8 hours in December to over 16 in June — one …
Manchester
Depending on which UK sleep survey you read, Manchester is either one of the best-sleeping cities in the count…
Dublin
A peer-reviewed study using 12 real noise-monitoring stations across Dublin found more than 80% of them record…
Europe
Wide latitude range, from Mediterranean summers to Scandinavian midnight sun.
Asia Pacific
Home to some of the world's most sleep-deprived populations, by national survey data.
Tokyo
Japan doesn't just have below-average sleep — by OECD's own 2021 comparison across 33 countries, it has the le…
Singapore
Singapore sits almost exactly on the equator, which means something most cities never experience: its daylight…
Sydney
A real 2023 study of Sydney traffic noise found something genuinely counter-intuitive: at similar average nois…
Mumbai
Academic research on light pollution in India specifically names Mumbai, alongside New York City, as a city th…
Middle East & Africa
Extreme heat and rapid urban light growth are the dominant local sleep factors here.
This is a small, growing pilot — more cities are added only once real, sourced data and genuine local research exist for them, rather than all at once from a template.