The department of
Sleep Science
Sleep science studies why we rest, dream, and wake — covering circadian rhythms, REM cycles, and sleep debt through research breakdowns, essays, and field notes.
Pieces
4
Circadian
May 2026 · 6 min
The Circadian Rhythm Is Older Than You Think — and Younger Than the Science
The idea that the human body keeps its own time — that there is a clock running inside us, independent of sunrise — sounds like something we have always known. We haven't.
By Megan Caldwell · Read →
Sleep Science
May 2026 · 4 min
What Hadza Sleep Logs Reveal About Cross-Cultural Sleep Patterns (and the 6.25-Hour Number)
A 2015 paper in Current Biology by Jerome Siegel and colleagues followed three pre-industrial groups — the Hadza of Tanzania, the San of Namibia, and the Tsimane of Bolivia — with wrist actigraphy for…
By Henry Ashford · Read →
Sleep Science
May 2026 · 5 min
How to Get More Deep Sleep Without Buying Anything
Your watch told you you got 47 minutes of deep sleep last night, and somewhere on the internet a chart said you should be getting closer to 90.
By Samuel Briggs · Read →
Insomnia
April 2026 · 10 min
The Real Causes of Insomnia, Ranked by What the Evidence Actually Shows
Somewhere between 30 and 35 percent of adults report insomnia symptoms in any given year. About 10 percent meet the criteria for chronic insomnia disorder.
By Diane Norwood · Read →
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