Intermittent theta-burst stimulation improves sleep in autism spectrum disorder by reorganizing brain networks

Real iTBS produced measurable sleep gains, and these improvements were accompanied by reorganization of overlapping brain networks across 13 cortical regions. Using spatial mapping tools, the researchers found that iTBS-related network changes aligned with the distribution of mGluR5 and GABA_A receptors in the brain—neurotransmitter systems implicated in both sleep and autism-related traits. Gene-expression analysis revealed that regions showing network reorganization were enriched for genes involved in glutamatergic synaptic transmission and calcium-dependent signaling, with peak expression during adolescence. A key limitation is that the study was limited to adults with ASD and insomnia, so generalizability to other populations remains unclear. The findings suggest iTBS may work by reorganizing brain networks involved in excitatory-inhibitory balance, a theory central to autism neurobiology.

The study's molecular profiling adds depth: iTBS-related network changes clustered around the Ca2+-PKA signaling axis, a fundamental cascade in neuroplasticity and sleep-wake regulation. Regions that reorganized were particularly enriched for cortical excitatory neuronal signatures with developmental peaks in adolescence—suggesting iTBS may restore age-appropriate network balance disrupted in autism. Subgroup analyses were not reported, so it remains unclear whether all autism phenotypes respond equally, or whether insomnia severity at baseline predicts response. Prior brain-stimulation trials in ASD have yielded mixed results; this study's neurochemical and transcriptomic corroboration of mechanism is relatively robust and may help explain why iTBS worked here. The 8-week duration is practical but relatively short; durability of sleep gains and network changes beyond the treatment window was not assessed.