The headline is broadly defensible, but the qualifications matter. Effect sizes vary by population, the strongest claims rest on shorter trials, and credible voices push back on how it's typically framed.
The neurons that that handle this are the so-called melanops and intrinsically photosensitive ganglion cells they don't pay attention to shapes they don't pay attention to much but they tell the brain when it's daytime and they tell the brain when it's absence of of light
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there's a set of cells in the neural retina which aligns the back of your eye they're sometimes called intrinsically photosensitive retinal ganglion cells they're sometimes called melanopsin retinol gangan cells we'll talk about those in a bit of detail in a moment it's well known that those cells are the ones that respond to two different types of light input not one but two different types of light input and send information to the hypothalamus where your master circadian clock resides and then your master circadian clock sends out secretory signals so peptides hormones but also neural signals to the brain and body and say hey now it's daytime now it's night time be awake be asleep
there's a set of cells in the neural retina which aligns the back of your eye they're sometimes called intrinsically photosensitive retinal ganglion cells they're sometimes called melanopsin retinol gangan cells it's well known that those cells are the ones that respond to two different types of light input not one but two different types of light input and send information to the hypothalamus where your master circadian clock resides