ScienceContemporaryglobalhigh confidence

Both cluster headaches and migraine have been associated with circadian genes and altered levels of circadian-related hormones, including cortisol and melatonin.

Notes on verification

Confirmed by peer-reviewed Neurology systematic review/meta-analysis (2023), independently corroborated by AAN press release and additional PubMed studies on melatonin/cortisol and circadian genes in headache disorders. [tier=gold indep_score=0.867 clusters=3 claim_tier=notable]

Sources