Anyone know of a mod to get rid of this fear of the dark issue?

Unfortnately, we're not supposed to directly link to mods on the forums.I think I found NatetheL0ser on google (that's a zero rather than an oh in Loser, btw) and used his mean Sims bugfix. That said, Daikoyu is referring to here: https://forums.thesims.com/en_US/categories/mods not the forum you're currently on.

I use a mod by Tears of Tyr for fears. There are two versions, one of which disables individual fears and the other which disables all fears. I use the individual ones because I'm not ready to disable the entire system, but if I never see "Fear of Unfulfilled Dreams" or "Fear of Dead End Job" ever again, it'll be TOO SOON. I got them off modthesims.info.