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D&D 5E Circadian Rhythms of the Underdark

What marks the cycle of days in the Underdark?

On the surface, the rising and setting of the sun help establish when the day starts and ends. However, there are many other natural circadian cycles that mark periods of the day. Birds start chirping in the morning. Nocturnal animals awaken at night. Flowers open in the morning, close in the evening. The temperature gets warmer throughout the day, colder throughout the night.

What would be equivalent circadian rhythms in the Underdark?

I like the idea of fungus that glows during "daytime" and fades at "night."

Tides that still feel the pull of the moon.

Flocks of bats or other flying predators that awaken at the same time every day, travel en masse to their hunting grounds, then return 12 hours later.

What are some other ideas?
 

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J.Quondam

CR 1/8
Periodic seismic activity, like geysers.
Feeding cycle of underground beasties, like cave crickets, darkmantles, or fire beetles or whatnot.
Changes in air currents in response to day/night/seasons on the surface.

Over very long terms, underdark denizens might mark the growth of stalagmites or the fading of glowing (radioactive) mineral veins.
 


Menzoberranzan uses Narbondel, a massive pillar on which magic is used to create light (fire in past editions) that would traverse the pillar to mark the passing of time and the end of a day.
 



Do cave animals have sleep patterns?
I believe they have found evidence of circadian rhythms even in blind cave fish.

Here's an article I failed to comprehend:

 

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