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 other thing to understand is this very firmly established fact, which is light powerfully inhibits melatonin. If you wake up in the middle of the night, and you go into the bathroom and you flip on the lights, and those are very bright, overhead, fluorescent lights, your melatonin levels, which would ordinarily be quite high in the middle of the night because you've been eyes closed in the dark, presumably, will immediately plummet to near zero or zero.
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Native comments, Twitter mentions, and Reddit threads about this claim — surfaced together so the conversation isn't fragmented across platforms.
Bookmarking — the dossier-vs-overview split is the right call. Most of the time I want overview; sometimes I want receipts.
Would love a "what would change this verdict" RSS feed. Sign me up if it exists.
The way this is seen is that if you were to measure your melatonin level over the course of the day, if you could do this, you know, hour by hour, you'd see that it's really low during the day, very high at night. But if you get up in the middle of the night and go to the bathroom and turn on the bright fluorescent light, your melatonin level is slammed to the floor.