diff --git a/constants/battle_constants.asm b/constants/battle_constants.asm
index b394b7a2..2ae1cdef 100644
--- a/constants/battle_constants.asm
+++ b/constants/battle_constants.asm
@@ -57,7 +57,7 @@ DEF NOT_VERY_EFFECTIVE EQU 05
 DEF NO_EFFECT          EQU 00
 
 ; non-volatile statuses
-DEF SLP EQU %111 ; sleep counter
+DEF SLP_MASK EQU %111 ; 0-7 turns
 	const_def 3
 	const PSN ; 3
 	const BRN ; 4
diff --git a/engine/battle/core.asm b/engine/battle/core.asm
index 66ca1aa9..1a252c02 100644
--- a/engine/battle/core.asm
+++ b/engine/battle/core.asm
@@ -308,7 +308,7 @@ MainInBattleLoop:
 	and a
 	ret nz ; return if pokedoll was used to escape from battle
 	ld a, [wBattleMonStatus]
-	and (1 << FRZ) | SLP ; is mon frozen or asleep?
+	and (1 << FRZ) | SLP_MASK
 	jr nz, .selectEnemyMove ; if so, jump
 	ld a, [wPlayerBattleStatus1]
 	and (1 << STORING_ENERGY) | (1 << USING_TRAPPING_MOVE) ; check player is using Bide or using a multi-turn attack like wrap
@@ -2934,7 +2934,7 @@ SelectEnemyMove:
 	and (1 << CHARGING_UP) | (1 << THRASHING_ABOUT) ; using a charging move or thrash/petal dance
 	ret nz
 	ld a, [wEnemyMonStatus]
-	and SLP | 1 << FRZ ; sleeping or frozen
+	and (1 << FRZ) | SLP_MASK
 	ret nz
 	ld a, [wEnemyBattleStatus1]
 	and (1 << USING_TRAPPING_MOVE) | (1 << STORING_ENERGY) ; using a trapping move like wrap or bide
@@ -3275,7 +3275,7 @@ PrintGhostText:
 	and a
 	jr nz, .Ghost
 	ld a, [wBattleMonStatus] ; player's turn
-	and SLP | (1 << FRZ)
+	and (1 << FRZ) | SLP_MASK
 	ret nz
 	ld hl, ScaredText
 	call PrintText
@@ -3317,7 +3317,7 @@ IsGhostBattle:
 CheckPlayerStatusConditions:
 	ld hl, wBattleMonStatus
 	ld a, [hl]
-	and SLP ; sleep mask
+	and SLP_MASK
 	jr z, .FrozenCheck
 ; sleeping
 	dec a
@@ -4029,7 +4029,7 @@ CheckForDisobedience:
 	call BattleRandom
 	add a
 	swap a
-	and SLP ; sleep mask
+	and SLP_MASK
 	jr z, .monNaps ; keep trying until we get at least 1 turn of sleep
 	ld [wBattleMonStatus], a
 	ld hl, BeganToNapText
@@ -5362,7 +5362,7 @@ MoveHitTest:
 	cp DREAM_EATER_EFFECT
 	jr nz, .swiftCheck
 	ld a, [bc]
-	and SLP ; is the target pokemon sleeping?
+	and SLP_MASK
 	jp z, .moveMissed
 .swiftCheck
 	ld a, [de]
@@ -5796,7 +5796,7 @@ ExecuteEnemyMoveDone:
 CheckEnemyStatusConditions:
 	ld hl, wEnemyMonStatus
 	ld a, [hl]
-	and SLP ; sleep mask
+	and SLP_MASK
 	jr z, .checkIfFrozen
 	dec a ; decrement number of turns left
 	ld [wEnemyMonStatus], a
diff --git a/engine/battle/move_effects/haze.asm b/engine/battle/move_effects/haze.asm
index c15c848b..76722d0e 100644
--- a/engine/battle/move_effects/haze.asm
+++ b/engine/battle/move_effects/haze.asm
@@ -24,7 +24,7 @@ HazeEffect_:
 .cureStatuses
 	ld a, [hl]
 	ld [hl], $0
-	and SLP | (1 << FRZ)
+	and (1 << FRZ) | SLP_MASK
 	jr z, .cureVolatileStatuses
 ; prevent the Pokemon from executing a move if it was asleep or frozen
 	ld a, $ff
diff --git a/engine/items/item_effects.asm b/engine/items/item_effects.asm
index f58b737e..16b4140a 100644
--- a/engine/items/item_effects.asm
+++ b/engine/items/item_effects.asm
@@ -225,7 +225,7 @@ ItemUseBall:
 	ld a, [wEnemyMonStatus]
 	and a
 	jr z, .skipAilmentValueSubtraction ; no ailments
-	and 1 << FRZ | SLP
+	and (1 << FRZ) | SLP_MASK
 	ld c, 12
 	jr z, .notFrozenOrAsleep
 	ld c, 25
@@ -380,7 +380,7 @@ ItemUseBall:
 	ld a, [wEnemyMonStatus]
 	and a
 	jr z, .skip5
-	and 1 << FRZ | SLP
+	and (1 << FRZ) | SLP_MASK
 	ld b, 5
 	jr z, .addAilmentValue
 	ld b, 10
@@ -878,7 +878,7 @@ ItemUseMedicine:
 	lb bc, ICE_HEAL_MSG, 1 << FRZ
 	cp ICE_HEAL
 	jr z, .checkMonStatus
-	lb bc, AWAKENING_MSG, SLP
+	lb bc, AWAKENING_MSG, SLP_MASK
 	cp AWAKENING
 	jr z, .checkMonStatus
 	lb bc, PARALYZ_HEAL_MSG, 1 << PAR
@@ -1700,7 +1700,7 @@ ItemUsePokeflute:
 .inBattle
 	xor a
 	ld [wWereAnyMonsAsleep], a
-	ld b, ~SLP & $ff
+	ld b, ~SLP_MASK
 	ld hl, wPartyMon1Status
 	call WakeUpEntireParty
 	ld a, [wIsInBattle]
@@ -1752,7 +1752,7 @@ WakeUpEntireParty:
 .loop
 	ld a, [hl]
 	push af
-	and SLP ; is pokemon asleep?
+	and SLP_MASK
 	jr z, .notAsleep
 	ld a, 1
 	ld [wWereAnyMonsAsleep], a ; indicate that a pokemon had to be woken up
diff --git a/engine/pokemon/status_ailments.asm b/engine/pokemon/status_ailments.asm
index 3da1fc43..05205a34 100644
--- a/engine/pokemon/status_ailments.asm
+++ b/engine/pokemon/status_ailments.asm
@@ -8,7 +8,7 @@ PrintStatusAilment::
 	jr nz, .frz
 	bit PAR, a
 	jr nz, .par
-	and SLP
+	and SLP_MASK
 	ret z
 	ld a, "S"
 	ld [hli], a