THE SLEEP OBSERVATORY
Sleep,
in context.
One study opens a larger conversation.
Follow the connections. Keep the evidence in view.
A living collection from John Griffin, MD.
Clear explanations. Primary sources. Room for uncertainty.
ONE COLLECTION / SEVERAL WAYS IN
Follow it. Keep it. Connect it.
This living handbook is the deeper dive. The booklet gathers two full articles and nine connected guides; the Atlas lets you explore the relationships.
START HERE / THE STUDY BEHIND THE POST
Our nights are part
of the world we build.
FOLLOW A QUESTION
Nothing sleeps
in isolation.
These are reading paths, not a causal diagram. An arrow invites exploration; it does not establish that one thing causes another.
THE COLLECTION / TAKE THE NEXT STEP
Go a little deeper.
Start with the short version. Open the evidence when you want to see the design, population, findings, and limits behind it.
No matching topics yet.
Try another word, or return to the full collection.
FROM THE RECENT EDITIONS / RETAINED READING
New studies, useful distinctions.
These summaries carry forward the October 24 PubMed abstract checks from the website edition. They are additional reading, not an expansion of the eleven-paper review recorded above.
A 2024 systematic review of acute stress after total sleep deprivation included 16 studies and 581 participants. Cortisol and autonomic responses varied, with most reported outcomes unchanged. The acute-stress question differs from simply measuring baseline cortisol. Read the review ↗
A five-cohort study associated more consolidated sleep and stronger slow oscillation-spindle coupling with better cognitive scores, but found no significant association between its nine sleep composites and future dementia. Read the 2026 study ↗
A 2026 review of 23 exercise trials found improvements in sleep-quality and insomnia questionnaires, with low-to-moderate certainty. That does not establish one universal exercise dose or a dementia-prevention effect. Read the exercise review ↗
DOCTOR IN THE LOOP
Better questions.
A more useful conversation.
This collection is education, not your medical chart or an individualized medical opinion. Your own clinician can consider your history, medicines, examination, tests, preferences, and circumstances.
Use the questions here to begin that conversation. Do not start, stop, or change treatment on the strength of a game, a post, or a single study.
A COLLECTION THAT CAN CHANGE
Knowledge keeps
unfolding.
How updates work
Type rough edits in the conversation. The reviewed collection can be revised while topic links stay stable. The version and change notes record what changed.
Editing this collection and sending a public post are separate actions. This page does not publish to social accounts, ingest new studies automatically, or update itself in the background.
What is included
Questions for the next review
The clock changed. Your body follows the light.
Read the November 1 light-and-sleep special in the living booklet →
Sleep deserves care. Every claimed benefit deserves a test.
Read this article in Longevity in daily life · Open the standalone article · Return to the Atlas
Connected reading updated November 2, 2026. The existing collection and its earlier PDFs retain their original review dates.