The evidence is convergent. Multiple independent sources reach the same conclusion, the underlying mechanism is well-characterized, and even the field's most cautious voices treat it as worth doing.
if you are in the second quartile third quartile or fourth quartile of nighttime light exposure so second being the least amount of nighttime light exposure third being more nighttime light exposure and fourth the most nighttime light exposure relative to the first quartile
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as you get to the fourth quartile of daytime light exposure you get about a 20% reduction in major depressive disorder
two second hypothesis greater light exposure at night is associated with higher risk for psychiatric disorders and poorer mood
and then once you get to that fourth quartile it's a big step it's a like a 30% greater risk of self har
basically what you see is that the probability of having worse major depressive symptoms linearly increases as you go from the second to third to Fourth quartile so more nighttime light exposure worse for you and there's a dose response if you will of the effect
when you go from the second to third quartile of nighttime light exposure so more than nighttime light exposure you basically go from no significant increase to almost almost a 20% increase and then as you get up to the fourth quartile so the most nighttime light exposure you're at about 25% increase in major depressive symptoms
the increasing light at night and the impact on depression or let let me be really technical in what I say and the relationship or correlation to depression is very strong