I purchased Fallout 4 on Steam, and have only downloaded mods through Nexus. 99% of the time using the Nexus Mod Manager.... yes, it is creepy, annoying, and I can't figure out how to make it stop.... It's not a child, If I'm correct its from PK, called Idiot Sl**t? or something along those lines, I do remember seeing a mod that changed the perks, specifically Idiot Savant and the various notifications, for well rested and dying, Perverted something, cant quite remember. It's to do with Vault Meat. As such, you've previously installed it, presumably manually, considering where its from. To check, go to your FO4 directory. Data\Sound\FX\UI and check if there is anything involving, health, perks and VATS.