KNOWLEDGE
Caffeine later in the day
Caffeine can temporarily increase energy, but taking it too late may worsen sleep for some people.
KNOWLEDGE UNIVERSE
Energy and daily rhythm
Caffeine, decisions, movement and basic daily energy as areas of self-observation, not diagnosis.
What you can do
- choose your own caffeine cut-off time
- record caffeine and sleep
- test 7 days without caffeine later in the day
- do not increase the dose after poor sleep
TOPIC DEPTH / SELF-OBSERVATION
From knowledge to self-observation
This layer organizes the existing topic rules. It does not add new claims or diagnoses.
How to observe
The minimum needed for meaningful self-observation.
Topic boundaries
- do not provide medical advice for pregnancy or heart disease
- there is no single time that is right for everyone
Data limitations
- Conclusions from a small number of check-ins are hypotheses.
- User self-report may be incomplete or variable.
- The app observes patterns; it does not confirm causes.
Interpretation limitations
- Do not use this for diagnosis or treatment.
- Do not promise an outcome or health improvement.
- Do not strengthen wording beyond the current level of source verification.
- If the user describes a health risk or crisis, the safety router takes priority.
Source limitations
- Sources require manual verification before strong claims are allowed.
Use for education and self-observation, not diagnosis or treatment.
Suggest a small safe step and encourage observation rather than a radical change.
EVIDENCE LAYER
Sources and limitations
Sources and conclusions require cautious language. This is education and self-observation, not diagnosis or treatment.
Dose and timing effects of caffeine on subsequent sleep: a randomized clinical crossover trial
Scope: Until full manual review is complete, use cautious wording and do not draw medical conclusions.
Limitations: Use as educational background. Do not create diagnoses or medical recommendations.
Open source ↗The effect of caffeine on subsequent sleep: A systematic review and meta-analysis
Scope: Until full manual review is complete, use cautious wording and do not draw medical conclusions.
Limitations: Use as educational background. Do not create diagnoses or medical recommendations.
Open source ↗