Clin Epigenetics. 2025 Apr 2;17(1):55. doi: 10.1186/s13148-025-01860-w. ABSTRACT BACKGROUND: Sleep disturbances are known to have adverse effects on health, but knowledge on the effect of sleep disturbances on epigenetic ageing is limited. We investigated (1) whether symptoms of insomnia, obstructive sleep apnoea, sleep deprivation, and circadian rhythm lateness are associated…