Cancel bed return method if entity is ignoring sleep. Thanks to EdGruberman.

src/main/java/net/minecraft/server/EntityHuman.java

@@ -874,6 +874,8 @@ public abstract class EntityHuman extends EntityLiving {
     }
 
     public void a(boolean flag, boolean flag1, boolean flag2) {
+        if (this.fauxSleeping) return; // CraftBukkit - Can't leave bed if not in one!
+
         this.b(0.6F, 1.8F);
         this.m_();
         ChunkCoordinates chunkcoordinates = this.E;