Evidence Lab
A small adult sleep study suggests substantial caffeine can affect sleep even when taken several hours before bed. Nour turns that into a gentle timing experiment, not a caffeine ban.
Nour's comic
The art carries only the story beat. The claim, evidence strength, limitations, and sources stay in readable page copy.
Nour likes the ritual, then notices bedtime keeps feeling farther away.
The story is about timing, not deciding that coffee is bad.
The panel stays symbolic; the study dose, timing, and caveats are rendered below as text.
The evening drink can still feel familiar without turning the routine into a rule.
The caveat stays visible: sensitivity, health context, and clinician guidance matter.
Read the evidence
This story uses one small randomized adult study and public health guidance. It is about trying an earlier window for substantial caffeine, not prescribing a sleep treatment.
Small randomized sleep study
Drake et al. tested 400 mg caffeine at bedtime, 3 hours before bedtime, and 6 hours before habitual bedtime. Each timing disrupted sleep compared with placebo in a small adult study.
Dose and sensitivity context
The story does not tell every person to use the same cutoff. Caffeine source, dose, tolerance, metabolism, and timing can change the result.
Important caveat
Pregnancy, breastfeeding, medications, heart rhythm concerns, anxiety, insomnia or other sleep disorders, and clinician guidance can change what is appropriate.
Safety boundary
Keep it optional. Sleep symptoms, pregnancy, medication, health conditions, and professional guidance come first.
Sources
Campaign learn_caffeine_cutoff leads to the App Store or Android testing request path. Android remains an internal testing request, not a public Play Store availability claim.