Autumn 2026 · shorter days, earlier dusk
CortexLit publishes interactive article-apps on everyday habits: sleep, light, caffeine, movement and focus. Every claim links to a source that was checked, uncertainty is stated plainly, and each guide ships with free companion tools that run entirely in your browser.
Every tool on this page runs client-side: no account, no upload, and it keeps working offline.
Read the trust principles →Fifteen highlighted companion tools, rendered from a JSON data set that carries each tool's category, version, review status and cited-source count. Filter, search and sort the grid below and it re-renders in place, with no page reload and no layout jump. Active-user and latency read-outs are generated in the browser and labelled simulated everywhere they appear.
Sleep advice usually centres on duration. The regularity research treats day-to-day stability of bed and wake times as a separate axis.
Reviews of light timing in adults point the same way: brighter mornings, dimmer evenings. Indoor winter light loses that contrast.
That controlled trial is why the cut-off calculator counts backwards from bedtime instead of offering a generic afternoon rule.
Trials show measurable effects from breaking up sitting, so the tools build one if-then cue that fits a moment your day already has.
Each article moves through a relay with a checkpoint at every handoff. Nothing crosses a checkpoint unverified. If a check fails, the work stops instead of improvising.
A defined question, recorded searches of PubMed, PMC, Europe PMC, Cochrane, trial registries, and recognized guidelines. Each source is checked to make sure it resolves, matches its citation, and hasn't been retracted.
Every claim is tied to its sources, with study type, population, and limitations. It also gets a plain-language certainty label (high, moderate, low, or very low). Associations are never presented as causes.
One self-contained interactive page with the takeaway, evidence cards, topic-specific cautions, and a plan builder. It works offline and needs no account.
At least two small single-purpose tools per article, like a timing planner or an if-then builder. Every output cites a PubMed or Cochrane source. The free tier does the whole job.
Each article shows its review status. Articles not yet reviewed by a qualified clinician are labeled that way. The list loads from metadata.json, so it is always the published set, never a hand-copied index.
With JavaScript on, this list is rebuilt live from metadata.json as you reach it. Without JavaScript, or when the page is opened straight from disk, the generated snapshot below shows every published article.
A plain-language look at what studies show about breaking up long stretches of sitting, how certain that evidence is, and how to choose one small movement-break cue you can actually keep.
Caffeine does not simply keep you awake while it is in your system. A single 400 mg dose taken six hours before bed measurably reduced sleep in a controlled trial, and pooled data from many studies show later intake pushes sleep onset later and shortens total sleep time. The catch is that people vary a lot in how fast they clear caffeine, so a single universal cut-off hour is not supported. The practical move is to pick a personal cut-off a fixed number of hours before your own bedtime, then judge it by how you sleep.
The common version of this advice is that blue light from screens ruins sleep. The measured effect is broader than that. In a controlled laboratory study, ordinary room light in the hours before bed delayed melatonin onset in almost every participant and shortened melatonin duration by about 90 minutes. A systematic review of light and circadian timing found that evening and night light pushes the body clock later. That points to a wind-down built around lowering the light you are in, rather than only swapping a screen for a filter.
The instruction to drink eight glasses of water a day has no direct scientific support. A well-known critical review traced the number to a misread 1945 recommendation that counted water from all sources, including food, and found no studies backing a rigid target for healthy, sedentary adults in temperate climates. That does not make hydration unimportant. Low-intake dehydration is common in community-dwelling older adults, in whom the thirst signal is blunted, which is exactly the group a simple routine helps most.
Re-reading and highlighting feel productive and are among the least effective common study habits. Two meta-analyses show that being tested on material beats re-studying the same amount of it for long-term retention, and a meta-analysis of classroom quizzing found the benefit holds across subjects and ages. A systematic review of distributed and retrieval practice in health professions education found spreading sessions out and retrieving from memory both improve later performance. The combination is a schedule, not a technique you can buy.
Light is the dominant environmental cue for the sleep-wake cycle. A systematic review of light amount and timing in community-dwelling adults found that brighter morning light is associated with earlier sleep timing and better self-reported sleep, while brighter evening light shifts sleep later and is associated with worse self-reported sleep. A systematic review of light and circadian rhythm found morning light advances circadian phase. A large 2025 observational study adds population-level associations between sunlight timing and sleep, but as observational work it cannot establish cause.
Sleep advice usually centres on duration. Regularity research suggests the day-to-day stability of bed and wake times is its own dimension of sleep health. A systematic review of 59 primary studies found consistent associations between irregular sleep timing and worse mental, metabolic, vascular and cognitive outcomes, and higher all-cause mortality, independent of duration. A prospective cohort study found sleep regularity was a stronger predictor of mortality than sleep duration in that sample. These are observational findings, so they describe associations rather than prove that stabilising a schedule will improve health.
Breaking up sitting with short bouts of light activity has one of the clearer acute effects in metabolic research. A systematic review and meta-analysis of seven acute randomised crossover trials found that interrupting prolonged sitting with standing or light-intensity walking lowered post-meal glucose, and that light walking outperformed standing. WHO physical activity guidance supports the broader pattern: reduce sedentary time, and some activity is better than none. The caveat is that these were short laboratory protocols, not long-term trials of walking after dinner.
WHO guidance recommends adults do muscle-strengthening activity on two or more days a week, alongside aerobic activity. A meta-analysis of 16 prospective cohort studies found that any muscle-strengthening activity was associated with roughly 10-17% lower all-cause mortality and lower risk of several non-communicable diseases, with the lowest risk around 30-60 minutes a week and a J-shaped curve at higher volumes. These are cohort associations, not trials, so they describe people who strength-train rather than proving the training caused the difference.
Protein pacing - eating roughly equal protein at each meal - is widely recommended on the assumption that it maximises muscle protein synthesis. The trial evidence is mixed. A systematic review of 15 studies found evenness associated with higher muscle mass in only three of seven studies and with higher protein synthesis in only one of six. Two randomised trials in older adults reached different conclusions: one found better whole-body protein net balance with even intake but no difference in muscle protein synthesis, and another found no difference at all when total intake was adequate.
Fibre has one of the stronger evidence bases in nutrition. A WHO-commissioned series of systematic reviews and meta-analyses in the Lancet found higher fibre intake associated with lower mortality and lower risk of several non-communicable diseases. A separate meta-analysis of 25 datasets found the highest versus lowest intake associated with lower colon cancer risk, with moderate heterogeneity. Both are largely observational in the underlying data, so they describe associations in populations that differ in many ways beyond fibre.
Slow breathing is one of the more accessible stress techniques, and it has been tested properly. A meta-analysis of randomised controlled trials found self-reported stress was lower after breathwork than in controls, with small-to-moderate effects on mental health outcomes. A systematic review of slow breathing in healthy people found increases in heart-rate variability and respiratory sinus arrhythmia, markers of greater parasympathetic activity. Both bodies of evidence come with caveats: trials were short, techniques varied, and control conditions were often weak.
Alcohol's effect on sleep is biphasic, and the evidence on that pattern is consistent. A critical review of alcohol administration studies in healthy volunteers found reduced sleep onset latency and increased slow-wave sleep early in the night, followed by increased disruption in the second half and suppressed REM. A review of alcohol and sleep homeostasis found alcohol interferes with sleep regulation, contributing to insomnia-like disruption as blood alcohol falls. Neither is a meta-analysis, so the direction of the effect is well described but its size across populations is less precisely established.
Tai chi is a low-impact movement practice, and it is one of the better-studied ones. Pooled trials in older adults show improved balance tests and fewer falls. The fitness outcomes are weaker evidence. This article separates the two, translates the trial doses into a weekly plan, and is clear that tai chi is activity, not treatment.
A 2026 meta-analysis of 23 studies found walking had a large effect on divergent thinking - generating ideas - and no clear effect on convergent thinking, the analytic kind. The result is real, short-lived, and mostly measured in students. This article separates the two kinds of thinking, builds a walking block around the evidence, and explains why the mood and step-count evidence is weaker.
The biggest hobby dataset in the literature links having a hobby to fewer depressive symptoms and higher self-rated health in adults aged 65 and over, across 16 countries. It is observational, so it cannot show that starting a hobby improves anything. The craft and arts trial literature is stronger on short-term effects and weaker on rigour. This article sorts the two, then helps you choose one hobby and give it a slot in the week.
Large prospective cohorts associate one or two fish meals a week with lower cardiovascular mortality, with the benefit flattening - and in Western cohorts bending the other way - at high intakes. Randomised omega-3 supplement trials found little or no cardiovascular effect, which is not the same as saying fish fails. This article separates food from supplement evidence, handles mercury and pregnancy carefully, and builds a one-meal-at-a-time plan.
Indoor plants are studied mostly with short experiments and field surveys. Pooled analyses find small physiological and cognitive signals, and office field studies find improvements in workspace ratings - but not in stress or concentration. The popular claim that potted plants clean indoor air does not survive arithmetic. This article states each of those at the size the evidence supports, then helps you pick a plant habit anyway.
A meta-analysis of 138 randomised studies found that prompting people to monitor their progress improved goal attainment, and that recording or reporting progress made the effect larger. Goal setting on its own also works. Meanwhile, tracker trials show modest short-term gains and pedometer programmes show very low certainty of lasting effect, and a case series describes people whose tracking made things worse. This article designs one check-in that does the job.
These rules come first. If a feature or a business goal conflicts with them, the feature changes.
Every claim cites a source that has been checked, and every tool output carries a PubMed ID or Cochrane review ID. No made-up citations, quotes, reviews, or test results. A claim that can't be verified gets narrowed or dropped.
Cautions, citations, evidence cards, when to seek professional help, and the main takeaway are always free. They are never behind a signup or an upgrade prompt.
Reading and the free tools need no account and no personal data. No third-party scripts, no hidden tracking. The particles, the counters and every tool output are computed in your browser and go nowhere.
Designed for keyboard and screen-reader use and small screens, with a still alternative for every animation when reduced motion is on. The animated canvas is decorative and hidden from assistive tech; pages keep working offline and in print.
Paid tiers, affiliate links, and sponsorships are disclosed next to every tool link and in the footer, even when there are none. No fear, urgency, countdowns, or guilt streaks.
General-wellness topics for generally healthy adults. Every topic below is live: each one opens a published article with its evidence ledger and free companion tools. New entries stay hidden until their evidence is verified and a qualified reviewer signs off, so the published set remains small and checkable — and because this grid is generated from the catalog, nothing can linger as “coming soon” once its article exists.
Wind-down, morning light, and a schedule you can actually keep.
How late is too late — and what the controlled trials really show.
Break up sitting, walk after meals, and build strength twice a week.
Hydration, fibre, protein and alcohol — minus the myths.
Study methods, focus and goal habits that hold up.
Paced breathing and other ways to dial down stress.
Hobbies and time off that genuinely restore you.
Small everyday surroundings, and the effects they really have.
CortexLit is a general-wellness publication for generally healthy adults. It is for education only and is not medical advice, diagnosis, or treatment.
We do not cover diagnosing or treating conditions, pregnancy, children, medicines or supplements, dosing, or calorie and weight targets. Every article lists topic-specific cautions and reasons to see a professional.
