Pistachios and Sleep: Can Their Nutrients Improve Rest?

What Does the New Review Say About Pistachios and Sleep?

Published in September in Nutrition Research Reviews, the narrative review examines pistachio compounds involved in sleep physiology, including tryptophan, magnesium, vitamin B6 and plant-derived melatonin. Tryptophan helps supply the pathway that produces serotonin and melatonin. However, identifying these ingredients in food does not establish an effective treatment dose or demonstrate improvements in sleep duration.

The review received support from American Pistachio Growers and the National Institutes of Health. Senior author Marie-Pierre St-Onge disclosed an advisory role with the growers' organization. These relationships warrant transparency; independent trials would help establish whether the proposed benefits translate into meaningful changes for patients. [Published review and disclosures](https://doi.org/10.1017/S0954422426100511).

Have Trials of Nighttime Pistachio Snacks Demonstrated Better Sleep?

A randomized crossover trial published in The Journal of Nutrition in 2024 assigned adults with prediabetes to consume 57 grams of pistachios nightly or receive advice about a carbohydrate snack, with each intervention lasting 12 weeks. Researchers randomized 66 participants, and 51 completed the trial. Its reported outcomes concerned blood sugar, cardiovascular risk markers and diet quality. [Trial report](https://pubmed.ncbi.nlm.nih.gov/38278217/).

Diet quality improved during the pistachio intervention, but investigators found no significant differences between conditions in fasting glucose, HbA1c or the other reported cardiometabolic measures. The timing of the snack should not be mistaken for evidence about sleep: the reported outcomes do not establish faster sleep onset, fewer awakenings or longer sleep. This illustrates why a food's nutritional value and its effectiveness for a particular symptom require separate assessment. [Study findings](https://pubmed.ncbi.nlm.nih.gov/38278217/).

What Should People With Persistent Insomnia Do?

The National Heart, Lung, and Blood Institute identifies cognitive behavioral therapy for insomnia, or CBT-I, as the usual first treatment for long-term insomnia. Typically delivered over six to eight weeks, it combines strategies addressing sleep-related worry, time spent awake in bed and sleep scheduling. Its purpose is to change the patterns that perpetuate insomnia. [NHLBI treatment guidance](https://www.nhlbi.nih.gov/health/insomnia/treatment).

Consistent bedtimes and wake times, a dark and quiet bedroom, and avoiding caffeine, nicotine and alcohol near bedtime can also support sleep. People whose sleep problems persist should discuss them with a healthcare professional rather than repeatedly changing foods or supplements without assessing the underlying difficulty. [NHLBI sleep recommendations](https://www.nhlbi.nih.gov/health/insomnia/treatment).

Melatonin also requires careful interpretation. The hormone helps regulate the body's daily timing system, but that does not make every melatonin-containing product an effective insomnia treatment. The National Center for Complementary and Integrative Health reports insufficient strong evidence to recommend melatonin supplements for chronic insomnia. Benefits for some circadian timing problems cannot automatically be generalized to persistent difficulty sleeping. [NCCIH melatonin guidance](https://www.nccih.nih.gov/health/melatonin-what-you-need-to-know).