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Comment by sakebomb | Hacker News Reader

Makes you wonder if light pollution is wrecking this process.

There's a lot of orders of magnitude between a light-polluted night and even an overcast day. Your really-quite-good eyes make the difference look much smaller than it really is.

Is it possible that a bee's eyes perform light-level normalization as well?

Low-intensity lights/screens (compared to the sun) wreck havoc on our circadian rhythms, it seems plausible that it disrupts the (not just circadian) rhythms of other organisms as well.

An important question to answer is why this wouldn't be an issue with moonlight.

Sure. Perhaps there's something intrinsically different about moonlight - humans don't have their circadian rhythms disrupted by it, like they do with screens and artificial lights.

Judging from how hard it can be to sleep during a full moon while camping, I'd say the reason humans aren't generally affected by it is because they sleep underneath opaque shelters that block direct light.

You need to be out in open and a very dark place, and with very clear skies, to really notice how bright the moonlight can be - in cities it's just not noticeable. Honestly it never affected my sleep since I was usually dead tired from whole day of hiking and I'm not very sensitive to lights anyways, but I remember on more than one occasion that some people in my group complained not being able to fall asleep or about sleeping bad in semi-transparent tents because of super-bright full Moon.

This is something I've wondered about. People keep talking about how it's blue light that keeps you awake, but moonlight is pretty bluish. Why would humans have evolved to have that as the don't sleep wavelength?

Moonlight is white, just like how the sun is white. The moon = blue, sun = yellow connotations are mostly cultural.

Just looked it up. Apparently it's due to the Purkinje Effect, i.e. "The tendency for the peak luminance sensitivity of the human eye to shift toward the blue end of the color spectrum at low illumination levels."

I just googled it and apparently moonlight is actually redder (or yellower if you prefer) than sunlight.

Here is a thread with a graph of the spectrum: https://physics.stackexchange.com/questions/244922/why-does-...

No, it doesn't make me wonder if anthropic lighting is impacting bee flight. If anything, they can fly later at night.

>If anything, they can fly later at night.

I feel like this is such an American/Capitalist attitude.

It's fine! They'll be more efficient and collect more honey!

Yet another capitalist scheme to make workers work longer hours. I read about it on BuzzFeed.

Top 10 Ways To Maximize Anthophilic Output

I recently walked through a park at night, and noticed that the deer were still up and about. Then I noticed that all along the enclosure there were bright white street lamps. It struck me then, how inconsiderate this was for the deer.

Deer are mostly crepuscular and other than that more active during night time than day time. What you saw likely has little to do with the street lamps.

Sure, but when are they exposed to darkness? When there's a power outage, which hasn't happened within my lifetime.

I'm pretty sure if I had to live with lamps shining on my face all night it would disrupt my circadian rhythm, regardless of when I naturally prefer to sleep.

The point is that deer being active at night isn't an indication of street lamps disrupting their ciradian rhythm. It's possible that those street lamps do affect it, but the behavior you saw isn't evidence of that.

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