sigh

code/modules/mob/living/life.dm

@@ -3,7 +3,7 @@
   * Splits off into PhysicalLife() and BiologicalLife(). Override those instead of this.
   */
 /mob/living/proc/Life(seconds, times_fired)
-	set waitfor = FALSE		// yeah hey we're kind of on a subsystem, no sleeping will be tolerated here!
+	SHOULD_NOT_SLEEP(TRUE)
 	if(mob_transforming)
 		return
 
@@ -80,7 +80,7 @@
 		handle_diginvis() //AI becomes unable to see mob
 
 	if((movement_type & FLYING) && !(movement_type & FLOATING))	//TODO: Better floating
-		float(on = TRUE)
+		INVOKE_ASYNC(src, /atom/movable.proc/float, TRUE)
 
 	if(!loc)
 		return FALSE

code/modules/mob/living/living.dm

@@ -802,7 +802,7 @@
 	else
 		throw_alert("gravity", /obj/screen/alert/weightless)
 	if(!override && !is_flying())
-		float(!has_gravity)
+		INVOKE_ASYNC(src, .proc/float, !has_gravity)
 
 /mob/living/float(on)
 	if(throwing)

code/modules/mob/living/simple_animal/hostile/jungle/leaper.dm

@@ -81,7 +81,7 @@
 
 /obj/structure/leaper_bubble/Initialize()
 	. = ..()
-	float(on = TRUE)
+	INVOKE_ASYNC(src, /atom/movable.proc/float, TRUE)
 	QDEL_IN(src, 100)
 
 /obj/structure/leaper_bubble/Destroy()