Promotes alpha brain wave activity - the same relaxed-but-alert state you're in just before sleep, or right after a good meditation.

Crocus sativus (saffron) supports sleep by acting on the neurobiological pathways involved in insomnia. Its bioactive compounds, crocin and safranal, produce mild calming and sleep-promoting effects — mainly by strengthening inhibitory neurotransmission and reducing the hyperarousal that keeps people awake.

Clinically, saffron supplementation has been shown to significantly improve sleep quality and duration and reduce insomnia severity versus placebo, pointing to faster, more efficient sleep onset.

https://www.researchgate.net/publication/372456969_

https://pmc.ncbi.nlm.nih.gov/articles/PMC9517076/