Sleep and endocrine effects of acupuncture for insomnia: a systematic review and meta-analysis of randomized controlled trials.

If you've ever lain awake staring at the ceiling, you're not alone. Insomnia affects millions of people worldwide and can take a serious toll on energy, mood, and overall health. Researchers have long suspected that sleep problems are connected to hormonal imbalances — particularly with melatonin (the hormone that tells your body it's time to sleep) and cortisol (a stress hormone that can keep you wired). Now, a new scientific review suggests that acupuncture may help on both fronts.

Published in Frontiers in Medicine, this study pooled results from 12 high-quality clinical trials to examine how acupuncture affects both sleep quality and hormone levels in people with insomnia. The researchers looked at well-known sleep measures — including the Pittsburgh Sleep Quality Index (PSQI), sleep efficiency, total sleep time, and how long it takes to fall asleep — alongside blood and saliva samples measuring melatonin and cortisol.

The results were encouraging. People who received acupuncture showed significantly better sleep quality scores compared to those receiving sham acupuncture or medications. Their sleep efficiency improved, they fell asleep faster, and they spent less time lying awake in the middle of the night. On the hormonal side, acupuncture was associated with higher melatonin levels and lower cortisol levels — a combination that supports more restful, restorative sleep. Electroacupuncture, a form of the treatment that uses gentle electrical stimulation on the needles, showed particularly consistent results for boosting melatonin.

These findings suggest acupuncture isn't just relaxing in a general sense — it may actively help reset the body's sleep-wake chemistry. For people who prefer to avoid sleep medications or who haven't found relief through other approaches, acupuncture could be a meaningful option worth exploring.

If you're considering acupuncture for insomnia, seek out a licensed, board-certified acupuncturist with experience treating sleep disorders.

This systematic review and meta-analysis (PROSPERO: CRD420251125885) analyzed 12 RCTs examining acupuncture's effects on sleep outcomes and endocrine markers in insomnia patients. Databases searched included PubMed, Embase, Cochrane Library, CNKI, and Wanfang through August 2025; risk of bias was assessed using RoB 2. Acupuncture-based interventions significantly reduced PSQI scores (MD = −3.39, 95% CI: −4.20 to −2.57) and improved polysomnographic sleep efficiency (MD = 6.40, 95% CI: 4.93 to 7.86), total sleep time, sleep onset latency, and wake after sleep onset. ISI improvement was significant versus sham controls (MD = −1.82) but not versus medication comparators. Endocrine findings demonstrated elevated serum melatonin (MD = 5.29, 95% CI: 3.01 to 7.57), with electroacupuncture subgroup showing low heterogeneity (I² = 0%), and reduced salivary cortisol (MD = −0.05, 95% CI: −0.02 to −0.08). High heterogeneity in pooled serum melatonin warrants cautious interpretation. Clinically, these findings support acupuncture — particularly electroacupuncture — as an evidence-informed intervention targeting both subjective sleep quality and HPA-axis dysregulation in insomnia.