The Subconscious Suvian Soundproofing System, or Four-S, keeps the fantasies of fanits from intruding on agents' and visiting canon characters' dreams. Borg regeneration alcoves can interfere with it.
- "At the Sign of the Multiple Exclamation Points" (FicPsych), Agent Nenya with Nurses Constance Sims and Nathonea Dewstan
- The Four-S is first mentioned.
- "Your in the Matrix, Charlie Brown!" (Peanuts x The Matrix), Agent Tawaki (DF) with Agent Tadkeeta (DOGA)
- Tawaki learns that his regeneration alcove may be interfering with the Four-S after dreaming of "drooling fanpoodles."