#12: Melatonin

Melatonin acts as a biological "starting official" that schedules sleep timing but does not significantly improve sleep quality or quantity. Triggered by darkness and inhibited by light, this hormone signals the body that it is nighttime, yet modern artificial light often disrupts its natural release. Meta-analysis data reveals that melatonin supplementation provides marginal benefits, hastening sleep onset by only 3.9 minutes and improving efficiency by a mere 2.2%. Furthermore, the supplement industry lacks rigorous regulation; testing shows that pill concentrations can range from 83% less to 478% more than advertised. Rather than relying on unreliable supplements, optimizing sleep requires foundational habits such as maintaining a consistent schedule, ensuring a cool environment, and maximizing natural light exposure during the day while dimming lights before bed.