CortexLit tool · caffeine

Daily Caffeine Load Tracker

Add up what you actually consume in a day so you are reacting to a number rather than a feeling.

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What this is based on

Every output names at least one verified PubMed source.

Gardiner C, Weakley J, Burke LM, et al. The effect of caffeine on subsequent sleep: A systematic review and meta-analysis. Sleep Med Rev. 2023;69:101764.
PMID 36870101
Systematic review and meta-analysis of caffeine and subsequent sleep. · weight 1.0 · Caffeine taken before sleep lengthens sleep onset latency and reduces total sleep time; effects are dose- and timing-dependent.
Clark I, Landolt HP. Coffee, caffeine, and sleep: A systematic review of epidemiological studies and randomized controlled trials. Sleep Med Rev. 2017;31:70-78.
PMID 26899133
Systematic review of epidemiological studies and RCTs. · weight 1.0 · Caffeine close to bedtime disrupts sleep; individual sensitivity varies widely, so a single universal cut-off time is not supported.

Limits: Per-drink milligram values are typical published averages, not a measurement of your cup. The 400 mg reference is a widely used upper bound for healthy adults, not a threshold proven in the sleep studies cited here.

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