PaperMC/paper-server/nms-patches/net/minecraft/world/entity/ambient/EntityBat.patch

--- a/net/minecraft/world/entity/ambient/EntityBat.java
+++ b/net/minecraft/world/entity/ambient/EntityBat.java
@@ -30,6 +30,8 @@
 import net.minecraft.world.level.block.state.IBlockData;
 import net.minecraft.world.phys.Vec3D;
 
+import org.bukkit.craftbukkit.event.CraftEventFactory; // CraftBukkit
+
 public class EntityBat extends EntityAmbient {
 
     private static final DataWatcherObject<Byte> b = DataWatcher.a(EntityBat.class, DataWatcherRegistry.a);
@@ -130,16 +132,24 @@
                 }
 
                 if (this.world.a(EntityBat.c, (EntityLiving) this) != null) {
+                    // CraftBukkit Start - Call BatToggleSleepEvent
+                    if (CraftEventFactory.handleBatToggleSleepEvent(this, true)) {
+                        this.setAsleep(false);
+                        if (!flag) {
+                            this.world.a((EntityHuman) null, 1025, blockposition, 0);
+                        }
+                    }
+                    // CraftBukkit End
+                }
+            } else {
+                // CraftBukkit Start - Call BatToggleSleepEvent
+                if (CraftEventFactory.handleBatToggleSleepEvent(this, true)) {
                     this.setAsleep(false);
                     if (!flag) {
                         this.world.a((EntityHuman) null, 1025, blockposition, 0);
                     }
                 }
-            } else {
-                this.setAsleep(false);
-                if (!flag) {
-                    this.world.a((EntityHuman) null, 1025, blockposition, 0);
-                }
+                // CraftBukkit End - Call BatToggleSleepEvent
             }
         } else {
             if (this.d != null && (!this.world.isEmpty(this.d) || this.d.getY() < 1)) {
@@ -163,7 +173,11 @@
             this.aT = 0.5F;
             this.yaw += f1;
             if (this.random.nextInt(100) == 0 && this.world.getType(blockposition1).isOccluding(this.world, blockposition1)) {
-                this.setAsleep(true);
+                // CraftBukkit Start - Call BatToggleSleepEvent
+                if (CraftEventFactory.handleBatToggleSleepEvent(this, false)) {
+                    this.setAsleep(true);
+                }
+                // CraftBukkit End
             }
         }
 
@@ -193,7 +207,11 @@
             return false;
         } else {
             if (!this.world.isClientSide && this.isAsleep()) {
-                this.setAsleep(false);
+                // CraftBukkit Start - Call BatToggleSleepEvent
+                if (CraftEventFactory.handleBatToggleSleepEvent(this, true)) {
+                    this.setAsleep(false);
+                }
+                // CraftBukkit End - Call BatToggleSleepEvent
             }
 
             return super.damageEntity(damagesource, f);