 SCP-452 is a colony of Latrodectis Hesperus, the western American black widow, physically indistinguishable from normal spiders of its kind. SCP-452 has a preference to spin webs near areas where humans sleep, and when allowed to freely roam, will attempt to relocate if no humans sleep near its web for extended periods of over a week. When a sleeping human subject within 5 meters of an SCP-452 web enters rapid eye movement or REM sleep, SCP-452 suppresses the subject's ability to dream, even in subjects with chronic dreams and or nightmares.