Does Cacao Keep You Awake? What Has Actually Been Measured
No published trial has measured what eating cacao or dark chocolate in the evening does to sleep. So the honest answer to "does cacao keep you awake" is that two separate bodies of evidence exist and neither of them is about that question: analyses of how much caffeine and theobromine cacao contains, and sleep research conducted on isolated caffeine doses. Nobody has joined them up in a human trial.
That gap is where most of the content on this subject lives. Pages confidently describe a mechanism, in one direction or the other, and the mechanism is an inference stacked on top of two literatures that were never designed to meet. Here is what each one actually measured.
What cacao has been measured to contain
Cacao carries two methylxanthines in quantity: theobromine and caffeine. Razola-Díaz and colleagues, writing in Antioxidants in 2023, measured seven commercial cocoa powders by HPLC-DAD and found caffeine from 5.4 to 27.1 mg per gram of dry weight, theobromine from 8.87 to 15.1 mg per gram, and total methylxanthines from 19.4 mg/g in a Dominican Republic powder to 39.15 ± 2.12 mg/g in a Peruvian one. Seven products is a small sample, and the authors relaxed their significance threshold to p < 0.1 in places because of it.
For finished chocolate, the figures come from different studies. Meng, Jalil and Ismail reported 883.11 ± 3.54 mg of theobromine per 100 g in dark chocolate from the Malaysian market in Molecules in 2009, against 125.54 ± 0.98 mg in milk chocolate, using composites of four brands per type from one city. A compiled caffeine table published by Rocha and colleagues in Nutrients in 2022 lists dark chocolate at 114 mg of caffeine per 100 g and cocoa powder at 230 mg per 100 g, alongside brewed Arábica coffee at 45 mg per 150 mL cup and espresso at 112 mg per 40 mL cup.
Those last two numbers are the useful anchor, because they are measured in portions people recognise. The authors nonetheless say the dataset "should be applied with caution", report a coefficient of variation of 41% for brewed coffee and 52% for espresso, and note that the table covers 57 items in total.
What the caffeine and sleep literature measured
The sleep research is on caffeine, dosed on its own, not on chocolate. A 2023 systematic review and meta-analysis in Sleep Medicine Reviews by Gardiner and colleagues pooled 24 studies and reported, for caffeine against control, a reduction in total sleep time of 45 minutes, a fall in sleep efficiency of 7%, and an increase in sleep onset latency of 9 minutes. Wake after sleep onset rose by 12 minutes, light N1 sleep by 6.1 minutes, and deep N3 and N4 sleep fell by 11.4 minutes.
The authors then convert those pooled effects into timing suggestions for two reference doses: coffee at 107 mg per 250 mL taken at least 8.8 hours before bed, and a standard pre-workout serving at 217.5 mg taken at least 13.2 hours before bed.
| What was studied | What was reported |
|---|---|
| 24 studies, caffeine vs control (pooled) | Total sleep time −45 min; sleep efficiency −7%; sleep onset latency +9 min |
| Sleep architecture | Wake after sleep onset +12 min; N1 +6.1 min; N3/N4 −11.4 min |
| Reference dose, coffee 107 mg/250 mL | Suggested cut-off 8.8 h before bed |
| Reference dose, pre-workout 217.5 mg | Suggested cut-off 13.2 h before bed |
| Chocolate, cacao or theobromine | Not examined |
The bottom row is the point. The review's doses were delivered as caffeine, not as food, and its results are pooled across trial designs that differ in dose, timing and population. It says nothing about theobromine, nothing about chocolate, and nothing about what happens when both methylxanthines arrive together in a fat and sugar matrix that slows digestion.
Theobromine is a separate question, and a thinner one
Theobromine is the larger methylxanthine fraction in cacao and it is a distinct compound, not a weak caffeine. The sleep meta-analysis above did not study it. There is no equivalent pooled analysis of theobromine and sleep architecture to set beside it, which means anyone describing theobromine's sleep profile with confidence is extrapolating from caffeine, from animal work, or from nothing.
We cover the chemical distinction between the two in more detail in our note on how theobromine and caffeine differ in cacao and in the research comparing the two compounds. For the drinking format and its portion sizes, see caffeine in ceremonial cacao preparations.
What you can do with the numbers instead
Since nobody has run the trial, what remains is arithmetic you can do yourself with published figures and the percentage on your own pack. Work out how much chocolate you are actually eating, apply the commodity figures above with their stated variation, and compare the result against the coffee serving sizes in the same table. That is a dose comparison, not a prediction, and it is the most anyone can honestly offer.
The variation is the part to respect. A fivefold spread in caffeine across seven cocoa powders, a 41% coefficient of variation in brewed coffee, composite sampling in the chocolate data: these are not precise instruments. Treat any single number as a midpoint with a wide margin either side.
What is in a Chaski tube
Chaski Cacao is a 600 g tube of dark chocolate buttons at 77% cacao, with a daily dose of four buttons printed on the pack. The cacao is single-origin Peruvian and Ecuadorian and ground at low temperature. The sweetener is coconut sugar. There is no added cane sugar, no emulsifier, no seed oil and no palm oil in it, and every batch is tested for lead, cadmium and pesticides.
The caffeine and theobromine content of the tube has not been measured, so no figure is published for it, and the commodity ranges on this page are not a substitute for one. The composition and format are set out on the Chaski Cacao product page, and the rest of the library sits in our guides.
If a sleep question matters to you clinically, that is a conversation for a GP rather than a chocolate label.
Frequently Asked Questions
Has anyone studied cacao and sleep directly?
Not in a way that answers this question. The sleep evidence base cited here is a 2023 systematic review and meta-analysis in Sleep Medicine Reviews by Gardiner and colleagues, which pooled 24 studies of caffeine dosed on its own. It did not examine chocolate, cacao or theobromine. The cacao evidence cited here consists of compositional analyses that measured how much caffeine and theobromine various cocoa powders and chocolates contain. The two literatures have not been joined in a human trial of eating cacao before bed.
How much caffeine and theobromine does cacao contain?
Razola-Diaz and colleagues, in Antioxidants in 2023, measured seven commercial cocoa powders and found caffeine from 5.4 to 27.1 mg per gram of dry weight and theobromine from 8.87 to 15.1 mg per gram, with total methylxanthines from 19.4 to 39.2 mg per gram. A compiled table published by Rocha and colleagues in Nutrients in 2022 lists dark chocolate at 114 mg of caffeine per 100 g and cocoa powder at 230 mg per 100 g. Both sets are commodity reference values with wide stated variation.
What did the caffeine meta-analysis actually find?
Pooling 24 studies, the 2023 Sleep Medicine Reviews analysis reported that caffeine against control reduced total sleep time by 45 minutes, reduced sleep efficiency by 7% and increased sleep onset latency by 9 minutes. Wake after sleep onset rose by 12 minutes, N1 light sleep by 6.1 minutes, and N3 and N4 deep sleep fell by 11.4 minutes. The authors translate this into suggested cut-offs of 8.8 hours before bed for coffee at 107 mg per 250 mL and 13.2 hours for a 217.5 mg pre-workout serving.
Is theobromine covered by that research?
No. The meta-analysis examined caffeine. Theobromine is a separate methylxanthine and is usually the larger fraction in cacao, and there is no equivalent pooled analysis of theobromine and sleep architecture to place alongside the caffeine figures. Any confident description of theobromine's sleep profile is therefore an extrapolation from caffeine data, from animal work, or from neither. The compositional studies cited here measure how much theobromine is present; they do not measure what it does.
Does Chaski publish a caffeine figure for its tube?
No. The caffeine and theobromine content of the tube has not been measured, so no figure is published. What is published is the composition: a 600 g tube of dark chocolate buttons at 77% cacao, a stated daily dose of four buttons, single-origin Peruvian and Ecuadorian cacao ground at low temperature, coconut sugar as the sweetener, no emulsifiers, no seed oils, no palm oil and no added cane sugar, and every batch tested for lead, cadmium and pesticides.
Sources
- Razola-Díaz MDC, Aznar-Ramos MJ, Verardo V, Melgar-Locatelli S, Castilla-Ortega E, Rodríguez-Pérez C, Antioxidants, 2023;12(3):716
- Meng CC, Jalil AMM, Ismail A, Molecules, 2009;14(1):200–209
- Rocha PLA, Lima ALC, Saunders B, Reis CEG, Nutrients, 2022;14(20):4417
- Gardiner C and colleagues, Sleep Medicine Reviews, 2023;69:101764