I’ve had this idea buzzing around in my head for awhile now, but what if Sapiens had modifiers applied to their circumstances when crafting, or performing any other “in place” activity. The primary two I can think of to start with would be - “Indoors”, and “In Darkness”. When a Sapien is indoors, this gives them a minor productivity boost (I.E. speeds up crafting or research) given that they are protected somewhat from the elements. At the same time, the “In Darkness” debuff is applied when a Sapien is attempting to perform these actions while in darkness (Maybe this has varying degrees - so being inside on an overcast night is the most severe, while being outside on a full moon is the least severe). While active this debuff slows down crafting (or research) time since the Sapien is having trouble seeing. This feature thus encourages players to construct their crafting locations outdoors (such as near a campfire or torches) in the early game, in order to not suffer from these debuffs. (Torches and campfires probably shouldn’t be placed indoors however, given the fire hazard they pose).
Later in the game however, perhaps players could “research” two separate kinds of candles, which are far safer for indoor usage, and allow players to gain the “Indoors” buff for their Sapiens even at night-time, thus increasing overall productivity. I had two kinds of candles in mind that could be researched and used; earned at different points in the research tree. The first kind of candle is a “fat based” one used from the burning of hunted animal fats, while the other would be pitch based candles (requiring collected resin from trees and charcoal). In either case, a small bowl (clay or stone I guess) is needed to melt and mix the ingredients over a campfire in order to actually form candles. Once placed, a candle can be lit for a certain amount of time; after it burns out a Sapien can collect another freely, and place it back where the original once was (Maybe with a little hologram effect similar to when an object is being built showing where the candle is supposed to be before being replaced). I’m not sure how long candles burn for in real life, but I think it’d be fair if these candles could burn through a full night in game, as needing more than one per night might make it feel excessive.