Fatigue by occupation
Sitting all day, screen glare, air-conditioned offices, afternoon energy crashes — office fatigue has real physiological causes that most people never identify.
Find my specific causes — free →2-minute quiz · no account needed · instant results
Office workers spend an average of 10 hours per day sitting — more than they sleep.
British Heart Foundation, 2023
These are the specific physiological and psychological mechanisms behind your fatigue — not generic lifestyle advice.
Physical inactivity reduces mitochondrial density over time — meaning your cells become less efficient at producing ATP (your body's energy currency). Paradoxically, the less you move, the less energy you have to move.
Blue light from monitors suppresses melatonin production for up to 2 hours after exposure. Eight hours of screen exposure during the day, followed by evening device use, means many office workers go to bed with melatonin levels far below where they should be.
Air-conditioned environments are low humidity, which accelerates water loss through respiration. Most office workers are mildly dehydrated by mid-morning without realising it — and even 1–2% dehydration measurably reduces concentration and energy.
Desk-based work with high carbohydrate lunches and no physical activity to stabilise blood glucose produces the well-known 2–3pm energy crash. This isn't inevitable — it's a specific metabolic response to diet and inactivity patterns.
Based on what we know about office workers, these causes appear most frequently. Your quiz result will show which ones apply to you specifically.
Sedentary Lifestyle
Physical inactivity reduces mitochondrial efficiency and cardiovascular output — making everything feel harder than it should.
Screen Fatigue
Sustained visual focus and blue light exposure deplete mental energy and disrupt the melatonin needed for restorative sleep.
Dehydration
Air-conditioned offices accelerate fluid loss — and mild dehydration is one of the most common and most overlooked causes of fatigue.
The quiz identifies which of 15+ causes apply to you — with a confidence score and personalised explanation for each.
Our AI analysis looks at your sleep, stress, lifestyle, and symptoms to identify your specific causes — not a generic list for office workers.
Take the free assessment →Mental effort, sustained visual focus, and prolonged static posture are all physiologically draining — even without physical exertion. Add mild dehydration and blood sugar swings and the fatigue is entirely explicable. It's not laziness or boredom.
The afternoon dip has two causes: a natural circadian trough around 2–3pm, and blood sugar instability after a high-carbohydrate lunch. A protein-focused lunch, a 10-minute walk after eating, and staying hydrated can significantly reduce or eliminate it.
Yes — and the evidence is strong. Sedentary behaviour reduces VO2 max, mitochondrial density, and cardiovascular efficiency. The solution isn't a gym membership — standing breaks every 30–45 minutes and a daily 20-minute walk create measurable improvements in energy within weeks.