add a fade out and in

code/modules/hallucinations/effects/backrooms.dm

@@ -7,36 +7,50 @@ GLOBAL_VAR_INIT(backrooms_occupied, FALSE)
  */
 
 /datum/hallucination_manager/backrooms
+	// this is the total length of the hallucination, if it's too short it cuts off the end
+	trigger_time = 14 SECONDS
+	// Human that will see the hallucination
+	var/mob/living/carbon/human/human_owner
 	// Item that will copy the owner's visible contents
 	var/obj/item/clone_base
 
-/datum/hallucination_manager/backrooms/Destroy(force)
-	if(!ishuman(owner)) // not sure how we got here but alright
-		return
-	var/mob/living/carbon/human/human_owner = owner
-
-	GLOB.backrooms_occupied = FALSE
-	UnregisterSignal(human_owner, COMSIG_MOVABLE_MOVED)
-	human_owner.reset_perspective(human_owner)
-	QDEL_NULL(clone_base)
-	return ..()
-
 /datum/hallucination_manager/backrooms/on_spawn()
 	if(!ishuman(owner))
 		return
-	var/mob/living/carbon/human/human_owner = owner
-
+	human_owner = owner
 	// One person at a time in the backrooms, no backroom brawls allowed.
 	if(GLOB.backrooms_occupied)
 		return
 	GLOB.backrooms_occupied = TRUE
+	fade_out_trigger()
 
-	var/obj/spawn_location = pick(GLOB.backroomswarp)
+/datum/hallucination_manager/backrooms/proc/fade_out_trigger()
+	human_owner.overlay_fullscreen("sleepblind", /atom/movable/screen/fullscreen/center/blind/sleeping, animated = 1 SECONDS)
+	trigger_timer = addtimer(CALLBACK(src, PROC_REF(do_hallucination_trigger)), 1 SECONDS, TIMER_STOPPABLE)
 
+/datum/hallucination_manager/backrooms/proc/do_hallucination_trigger()
+	human_owner.clear_fullscreen("sleepblind")
 	RegisterSignal(human_owner, COMSIG_MOVABLE_MOVED, PROC_REF(follow_movement))
+	var/obj/spawn_location = pick(GLOB.backroomswarp)
 	clone_base = new(spawn_location)
 	clone_base.vis_contents += human_owner
 	human_owner.reset_perspective(clone_base)
+	trigger_timer = addtimer(CALLBACK(src, PROC_REF(fade_in_trigger)), 12 SECONDS, TIMER_STOPPABLE)
+
+/datum/hallucination_manager/backrooms/proc/fade_in_trigger()
+	human_owner.overlay_fullscreen("sleepblind", /atom/movable/screen/fullscreen/center/blind/sleeping, animated = 1 SECONDS)
+	trigger_timer = addtimer(CALLBACK(src, PROC_REF(end_fade_trigger)), 1 SECONDS, TIMER_STOPPABLE)
+
+/datum/hallucination_manager/backrooms/proc/end_fade_trigger()
+	human_owner.clear_fullscreen("sleepblind")
+
+/datum/hallucination_manager/backrooms/Destroy(force)
+	GLOB.backrooms_occupied = FALSE
+	UnregisterSignal(human_owner, COMSIG_MOVABLE_MOVED)
+	human_owner.reset_perspective(human_owner)
+	human_owner = null
+	QDEL_NULL(clone_base)
+	return ..()
 
 /datum/hallucination_manager/backrooms/proc/follow_movement(source, atom/old_loc, dir, forced)
 	// signal is called above in on_spawn so that whenever our human moves, we also move the clone