>I just wonder about how actually natural a pitch black sleep is. "Pitch black" is another thing entirely, but the moon is much dimmer than the light levels th

>I just wonder about how actually natural a pitch black sleep is. "Pitch black" is another thing entirely, but the moon is much dimmer than the light levels this study reports as causing depression (5 lux). And it's pretty dim (equivalent to stray light from a streetlamp). >The intensity of moonlight varies greatly depending on its phase, but even the full Moon typically provides only about 0.05–0.1 lux illumination https://en.wikipedia.org/wiki/Moonlight https://en.wikipedia.org/wiki/Moonlight