Topic
Sleep isn't one topic, it's a crossroads. How you sleep shows up in your memory, in your blood sugar, in your skin and in how long you live; and how you sleep is decided by the light in the room, the temperature of the bedroom and the hour you lie down. That is why there are twelve entries here instead of one long one. Below they are grouped by the question each of them answers; further entries that touch on sleep only in passing are in the full list underneath.
These four run outward from sleep. Learning is not filed away during the day but at night; your cells set how well they will handle sugar tomorrow according to the hours you slept; and with sleep length the surprise is not too little, it is too much. The skin barrier entry is the thinnest-backed of the four — a handful of human studies, not one of them a randomised trial, and the entry says so plainly.
Three things in your bedroom you probably never think about. Evening light reads to your body as daytime, and it is not only screens — ordinary room light is enough. A warm room costs you more sleep than a cool one. And your internal clock decides that when you sleep matters, not only how long.
Four habits that cost nothing and can be tried tonight. A hot soak an hour or two before bed is one of the few sleep tricks with real numbers behind it. Slow breathing is unglamorous and surprisingly well tested. With exercise, timing matters more than the workout itself. And with music the evidence says mostly yes, with one catch the entry names.
Not everyone starts from the same place. Half of women going through menopause report poor sleep, and the reasons run deeper than hot flashes alone. That is why this group has a single entry so far, but a thorough one.
Why we work through seven traditions: modern science was not the first to write about sleep. Ayurveda, TCM, Korean and Unani medicine, Kampo, Tibetan medicine and European herbalism each have their own advice on it. Sometimes it lines up with the studies, sometimes it does not, and that gap is the interesting part. Every entry therefore puts what the tradition says next to what can actually be shown.
Traditions
Wellness marketing invokes ancient authority constantly, and almost nobody checks it. We opened the primary texts — Culpeper's herbal of 1653, the Sushruta Samhita, Li Shizhen's Bencao Gangmu, the Dongui Bogam and the Tibetan canon — and looked up five of those claims.
Read entry · 8 min read
Sound & Vibration
A century-old auditory illusion has become a favorite pre-surgery calming trick, and the research on it is more specific, and more interesting, than the internet's sleep playlists suggest.
Read entry · 8 min read
Surroundings & Rhythm
Across cultures and continents, the advice about sleep and heat keeps pointing the same direction: too warm is the real enemy, and your bedroom temperature is doing more to your night than you probably realize.
Read entry · 7 min read
Nutrition & Food
Your cells listen to how much you sleep before they decide how well to handle sugar the next day.
Read entry · 6 min read