The Parva Journal
Sleep, food & routine
The context that sits beside a cognitive pattern: sleep timing, eating, movement, workload and the shape of a day.
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7 articles
Workload is not the same as cognitive load
Two jobs with identical hours can cost wildly different amounts. What actually makes work expensive, and which parts are adjustable.
The deficit you stop noticing
Performance declines with accumulated sleep loss while the feeling of being impaired adapts. That gap is why most people underestimate what their sleep is costing them.
The shape of a day matters more than the hours in it
Two days with identical contents, arranged differently, produce different amounts of work and different amounts of exhaustion. The arrangement is often the most adjustable thing available.
Sleep timing matters as much as sleep duration
Eight hours at irregular times is not the same as eight hours at consistent ones. Why regularity has its own effect, and what to change first.
Movement and thinking: what the evidence actually supports
Exercise has better evidence for cognition and mood than almost any lifestyle intervention — and the useful version is smaller and duller than the advice usually suggests.
Eating and mental energy, without the mythology
There is a great deal of confident nonsense about food and the brain. The parts that are reasonably supported are smaller, duller, and more useful.
Caffeine, honestly
It is genuinely useful and it is not free. What it does, what it only appears to do, and the specific way it hides a sleep problem.