Cellular switch casts light on why humans are active in the day
Phys.org
February 27, 2026
Early mammalian ancestors were nocturnal, sleeping during the day while the dinosaurs dominated the land. However, some mammalian lineages, including human ancestors, independently transitioned to diurnality (active during the day). Scientists have now discovered why humans are not nocturnal. A new study published in Science reveals that the answer is in the genes.
Verticals
sciencephysics
Originally published on Phys.org on 2/27/2026