Fixes many instances of lying mob getting shifted up (pixel_y reset to 0) by adding a lying_pixel_offset var to mob/living.

Removes the delay when toggling resting, sleeping and pouncing, the mob sprite will now update instantly.

code/game/objects/structures/stool_bed_chair_nest/alien_nests.dm

@@ -44,12 +44,14 @@
 
 /obj/structure/stool/bed/nest/post_buckle_mob(mob/living/M)
 	if(M == buckled_mob)
-		M.pixel_y += 6
-		M.pixel_x += 2
+		M.pixel_y = initial(M.pixel_y) + 6
+		M.pixel_x = initial(M.pixel_x) + 2
 		overlays += image('icons/mob/alien.dmi', "nestoverlay", layer=6)
 	else
-		M.pixel_x -= 2
+		M.pixel_x = initial(M.pixel_x)
 		M.pixel_y = initial(M.pixel_y)
+		if(M.lying)
+			M.pixel_y = M.lying_pixel_offset
 		overlays.Cut()
 
 /obj/structure/stool/bed/nest/attackby(obj/item/weapon/W as obj, mob/user as mob, params)

code/game/objects/structures/stool_bed_chair_nest/bed.dm

@@ -59,10 +59,8 @@
 	icon = 'icons/obj/rollerbed.dmi'
 	icon_state = "down"
 	anchored = 0
-	var/const/buckled_pixel_y_offset = 6 //Mobs buckled will have their pixel_y offset by this much
 
-
-/obj/structure/stool/bed/roller/post_buckle_mob(mob/M)
+/obj/structure/stool/bed/roller/post_buckle_mob(mob/living/M)
 	if(M == buckled_mob)
 		density = 1
 		icon_state = "up"
@@ -72,7 +70,7 @@
 		icon_state = "down"
 		M.pixel_y = initial(M.pixel_y)
 		if(M.lying)
-			M.pixel_y -= buckled_pixel_y_offset
+			M.pixel_y = M.lying_pixel_offset
 
 
 /obj/item/roller