Nourai

Evidence Lab

Move the bigger caffeine earlier.

The strongest lever here is not blame. A small adult sleep study suggests substantial caffeine can affect sleep even when taken several hours before bed. Nour turns that into a timing experiment, not a caffeine ban.

Claim
caffeine_cutoff_001
Domain
Sleep / caffeine
Boundary
Not treatment
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Read the evidence What this does not mean

Nour's comic

A caffeine timing story that does not ban the mug.

The art carries the comic reversal. The claim, evidence strength, limitations, and sources stay in readable page copy.

Nour holds a plain mug near a window while Luma watches a soft moon path outside, with no text.

The moon drifts down the path

Nour reaches for a late mug and notices bedtime drifting farther away.

Nour gently folds away a tiny costume cloak that Luma offers to a plain mug, with no text.

The mug is not the villain

Luma tries a tiny costume; Nour folds it away before the joke becomes a caffeine ban.

Nour and Luma view a blank moon-and-mug evidence card with abstract shapes and no readable text.

Timing does the work

The study points toward moving substantial caffeine earlier, while dose and sensitivity still matter.

Nour stands between an earlier mug and a cozy evening cup while Luma floats nearby, with no labels or numbers.

Same ritual, earlier seat

Nour moves the bigger caffeine moment earlier and keeps a familiar caffeine-free evening ritual.

A mug sits in a sunny chair while Luma puts away a folded costume cloak and Nour smiles, with no text.

The mug gets a better seat

The ending keeps the caveat visible: sensitivity, health context, and clinician guidance still matter.

Read the evidence

A timing idea, not a universal rule.

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

A high caffeine dose affected sleep even several hours before bed.

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 study dose is context, not a personal target.

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

Keep health context outside the comic.

Pregnancy, breastfeeding, medications, heart rhythm concerns, anxiety, insomnia or other sleep disorders, and clinician guidance can change what is appropriate.

Safety boundary

What this does not mean

Keep it optional. Sleep symptoms, pregnancy, medication, health conditions, and professional guidance come first.

  • It is not insomnia treatment, anxiety treatment, cardiac advice, pregnancy advice, or medication guidance.
  • It is not a caffeine ban, a moral rule, or a claim that caffeine is harmful for every person.
  • It is not a universal cutoff time. Some people may need a longer buffer, and some may notice little effect.
  • It does not use real sleep logs, wearable sleep scores, HealthKit, Health Connect, medication records, pregnancy status, anxiety history, cardiac history, or other private user data.

Sources

Follow the references.

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.

Caffeine timing sleep study DOI 10.5664/jcsm.3170 · PMID 24235903 · PMC3805807 PubMed record Caffeine effects on sleep taken 0, 3, or 6 hours before going to bed MedlinePlus caffeine guidance NLM consumer health guidance