Ketones and Sleep: What a New 2026 Review Says About BHB

A new review on ketones and sleep landed in Nutrients on October 20, 2026, and it comes from people who study sleep for a living: a team at Mass General Brigham, Harvard Medical School’s Division of Sleep Medicine and McLean Hospital. The question I get most after “how much BHB should I take” is “will it mess with my sleep?”, so I was glad to see researchers outside our industry pull this together.

The short version: the authors found real reasons to think BHB and other ketones talk to the systems that run sleep, but the human data is still small, and the effects depend on dose, timing and context. Below is what the review covered, what the human studies measured, and how I’d use goBHB® products day and night.

CleanForm Nutrition goBHB powder: caffeine-free BHB salts with calcium, magnesium, sodium and potassium.

What the 2026 Ketones and Sleep Review Covered

Jensen, Leavitt and Nehs wrote a narrative review, which means they gathered and interpreted the literature rather than pooling numbers into a single effect size. They looked at three layers of evidence: mechanisms (how ketone bodies interact with sleep circuits), animal models, and human studies of both ketogenic diets and exogenous ketones like BHB salts and ketone esters.

Their headline conclusion is that ketones are sleep-relevant metabolic signals, but their effects are conditional rather than universally sleep-promoting. I agree, and anyone claiming “BHB fixes your sleep” is ahead of the data. They also note that many of the human studies, including the D-BHB trial, relied on questionnaires instead of sleep-lab recordings.

The mechanisms they flagged

The review walks through several pathways. Adenosine is the molecule that builds “sleep pressure” through the day, and ketogenic feeding in animals lowered adenosine kinase, the enzyme that clears adenosine. Ketones at physiological levels may also open KATP channels that quiet neuronal firing, and those channels are involved in sleep-wake transitions. In experimental models, BHB suppresses the NLRP3 inflammasome, a finding first reported in cell and mouse work by Youm and colleagues in Nature Medicine (2015), and it acts as an epigenetic signal. The authors are careful to say the sleep relevance of those last two is inferred, not measured.

Adenosine is also central to our own in vitro work on BHB and the caffeine crash, which is internal, unpublished cell research and not proof of anything in people.

The Human Studies on BHB and Sleep

These trials used different ketone forms, doses and populations, so compare them with care.

StudyKetone and timingWhoWhat changedKatsuya 2025 (14 days)1.5 g or 2.9 g D-BHB, 1 hour before bed90 healthy adults, 20 to 49, tired with poor sleep scoresBetter self-rated sleepiness on rising (both doses); no change in sleep lengthRobberechts 2023 (one night)Ketone ester after evening HIIT and 30 min before bedTrained male cyclistsHigher sleep efficiency, less wake time, REM drop after hard exercise bluntedHypoxia study (one night)Ketone ester at simulated altitudeVolunteers sleeping in simulated hypoxiaBetter oxygenation only in severe desaturation; sleep architecture not rescued

Sources: Katsuya et al. 2025; Jensen et al. 2026 review (summarizing the ester studies).

The D-BHB trial from Japan

The Katsuya trial in Bioscience, Biotechnology, and Biochemistry is the one most relevant to BHB supplements. Ninety adults aged 20 to 49 with everyday fatigue and a Pittsburgh Sleep Quality Index score of 6 or higher took 1.5 g or 2.9 g of D-BHB, or a placebo drink, one hour before bed for 14 days. Both doses improved “sleepiness on rising” on a standard Japanese sleep questionnaire, the 1.5 g dose improved “initiation and maintenance of sleep,” and the 2.9 g dose improved “refreshing on rising.” Self-rated sleep length didn’t change, and no adverse events were reported.

Two caveats. The outcomes were all self-reported, with no sleep-lab recording, and the study was funded by Osaka Gas, whose employees authored it and whose subsidiary makes the D-BHB used. We covered the original trial in our first look at D-BHB and sleep quality, and the new review lands in the same place: promising, subjective, needs objective measures.

The ketone ester studies in athletes

The most interesting objective data comes from Robberechts and colleagues, who had trained cyclists finish a hard training day with an interval session ending one hour before bed. That workout cut REM sleep and increased time awake after falling asleep. When the riders drank a ketone ester after training and again 30 minutes before bed (pushing blood D-BHB to roughly 3 mM early in the night), sleep efficiency improved and the REM drop was blunted. The review reads this as a recovery effect, meaning ketones helped the body settle after stress rather than acting like a sleeping pill.

That was a ketone ester at a high blood level. BHB salts produce a lower peak in blood D-BHB than esters, which Stubbs and colleagues showed in Frontiers in Physiology (2017). I covered that difference in detail in ketone salts vs. ketone esters.

How Much Ketone Did the Sleep Studies Use?

Dose is where people get confused, so here is the spread across the bedtime studies with a defined gram amount. The Johns Hopkins K-SLEEP trial is still recruiting, and it uses a 1,3-butanediol drink, which the liver converts to BHB, so the grams aren’t equivalent to grams of BHB. Those are supervised research doses, not something to copy at home.

Bedtime ketone doses in sleep research

Grams taken before sleep. Purple = D-BHB; grey = 1,3-butanediol (a BHB precursor, trial in progress).

D-BHB, low dose (Katsuya 2025)1.5 gD-BHB, high dose (Katsuya 2025)2.9 g1,3-butanediol, dose 1 (K-SLEEP, recruiting)20 g1,3-butanediol, dose 2 (K-SLEEP, recruiting)40 g

Sources: Katsuya et al., Biosci Biotechnol Biochem 2025; ClinicalTrials.gov NCT07224074.

What jumps out to me is how small the D-BHB doses were. The Japanese team saw subjective changes at 1.5 g of pure D-BHB. Most BHB powders, including goBHB, are a D/L mix of mineral salts, so a scoop’s gram number isn’t the same as the trial’s D-BHB dose. The review says plainly that the ideal ketone level for sleep is unknown.

How I’d Use goBHB Products Around Sleep

This is my practical read, not a medical recommendation. If you want BHB in the evening, use a caffeine-free product. CleanForm Nutrition’s goBHB powder is a 50/50 D/L blend of calcium, magnesium, sodium and potassium BHB salts with 30 servings per tub, and the unflavored version is listed under NSF Certified for Sport. CleanForm also makes a goBHB Energy Shot with L-goBHB and zero caffeine. It’s built for daytime focus, and since the sleep trial used D-BHB, there’s no sleep data on this L form.

CleanForm goBHB Energy Shot: L-goBHB with zero caffeine and zero sugar.

MAC Energy is a different tool. Each 12 oz can has 2,000 mg goBHB plus 200 mg of Purcaf® caffeine and 250 mg of Cognizin®, so it belongs in your morning or before a training session, not after dinner. Caffeine that late in the day works against everything above.

MAC Energy pairs goBHB with caffeine, so it’s a daytime drink.

Safety notes before bed

BHB salts carry minerals, including sodium, so count them if you watch salt intake for blood pressure or kidney reasons. If you’re pregnant or nursing, take prescription medications, or have a diagnosed sleep condition, talk with your doctor before adding anything at bedtime. If you’re new to BHB salts, start with a half serving to check stomach tolerance. None of these products are meant to treat or prevent any disease.

Where the Evidence Stands

The new review gives us a fair scorecard. Ketones interact with adenosine signaling, neuronal excitability and inflammation, all relevant to sleep. In people, one 14-day D-BHB trial found better self-rated waking quality, and ketone ester studies in athletes showed better sleep efficiency after hard evening training. What we don’t have yet is a BHB salt trial with sleep-lab recordings, data in older adults, or clear dose and timing guidance.

FAQ

Does BHB help you sleep?

One randomized trial found that 1.5 g or 2.9 g of D-BHB taken an hour before bed improved how rested people felt on waking over 14 days. Sleep length didn’t change and results were self-reported.

Can I take BHB at night?

Caffeine-free BHB products can be taken in the evening, and the sleep trial dosed one hour before bed. Skip anything with caffeine, and watch the sodium in salts.

Do ketone supplements affect REM sleep?

In trained cyclists, a ketone ester taken after a hard evening workout blunted the drop in REM sleep that the workout caused. That was a high-dose ester, not a BHB salt, so don’t assume the same result from a scoop of powder.

What is the best time to take BHB for sleep?

The only D-BHB sleep trial dosed one hour before bed. Ideal timing hasn’t been established, so use that as a starting point.

The Bottom Line

A Mass General Brigham and Harvard team looked hard at ketones and sleep and came back with a measured verdict: ketones are worth studying for sleep, and the early human data is encouraging but small. If you use goBHB in the evening, keep it caffeine-free and modest, and judge it by how you feel in the morning. We’ll keep pushing for the objective sleep studies this field needs.

Sources: Jensen JC, Leavitt PC, Nehs CJ. Ketones and Sleep: A Narrative Review of Mechanisms, Preclinical Models, and Human Evidence. Nutrients. 2026;18(20):3437. Katsuya S, et al. Effect of d-β-hydroxybutyrate on sleep quality in healthy participants. Biosci Biotechnol Biochem. 2025;89(5):769-775 (funded by Osaka Gas). Robberechts R, et al. Exogenous Ketosis Improves Sleep Efficiency and Counteracts the Decline in REM Sleep after Strenuous Exercise. 2023. Stubbs BJ, et al. On the Metabolism of Exogenous Ketones in Humans. Front Physiol. 2017;8:848. Youm YH, et al. The ketone metabolite β-hydroxybutyrate blocks NLRP3 inflammasome-mediated inflammatory disease. Nat Med. 2015;21:263-269. K-SLEEP trial, NCT07224074. Product details from cleanformnutrition.com and drinkmac.com.