disable "sleeping" of actors in physics engine

src/commands.rs

@@ -588,6 +588,7 @@ fn spawn_entities(
                 camdistance: state.camdistance,
                 ..default()
             });
+            actor.insert(SleepingDisabled);
             actor.insert(world::DespawnOnPlayerDeath);
             actor.insert(actor::HitPoints::default());
             actor.insert(Position::from(state.pos));