wait, wouldn't the temperature in the cave change? you'd know it was summer/ winter cause it'd be warm/cold?,(reply>), Not if you're far enough from the surface. This is another reason why circadian rhythm isolation studies are done deep underground. (On the surface, the climate control system may give away clues about day and night, as well as seasons.,(reply>), @hiqwertyhi no, not really, no,(reply>), @hiqwertyhi Temps in caves do not change with the seasons.