# Brain’s biological clock uses light to track day 2026-08-12T22:16:08+00:00 | Health & Science | Indian Opinion Desk Corroboration: 1 independent outlet The Hindu examines the neural mechanisms behind the human body's 24-hour circadian rhythm. The article explains how the suprachiasmatic nucleus in the brain responds to light cues to synchronise sleep and wakefulness. This internal clock influences hormone release and metabolism. Researchers have identified specific genes and proteins that regulate this cycle. Disruptions to the clock, such as from shift work, can affect health. The story highlights the role of melanopsin-containing cells in the retina that send signals to the brain's timekeeper. ## Coverage - thehindu.com Tags: biological clock, brain, circadian rhythm, health, neuroscience, sleep Canonical: https://indianopinion.org/brains-biological-clock-uses-light-to-track-day/ License: Summary and commentary (c) Indian Opinion, reusable with attribution. Facts belong to the linked sources. Cite: https://indianopinion.org/brains-biological-clock-uses-light-to-track-day/#story-in-brief Review state: restored archive article, accurate at time of publication, not offered to search indexes.