This mod makes your home lots a hot spot for alien abductions! There will be about an 80% chance each and every night that the challenge is active on the lot that a Sim on the active lot will be abducted by aliens. It’s completely random when it will happen and, if there are multiple Sims on the lot, which Sim it will happen to. While testing, it took about a week before my Sim was abducted the first playthrough and then three days the second playthrough. So yeah, very random!