/**
    * Play the sleep animation for every nearby player.
    * @param alseep - the player asleep.
    */
    private void playSleepAnimation(Player asleep) {
        final PacketContainer bedPacket = plugin.manager.createPacket(PacketType.Play.Server.BED, false);
        final Location loc = asleep.getLocation();

        // [url]http://wiki.vg/Protocol#Use_Bed[/url]
        bedPacket.getEntityModifier(asleep.getWorld()).write(0, asleep);
        bedPacket.getIntegers().write(1, loc.getBlockX()).write(2, loc.getBlockY() + 1).write(3, loc.getBlockZ());
        broadcastNearby(asleep, bedPacket);
    }

    private void stopSleepAnimation(Player sleeping) {
        final PacketContainer animation = plugin.manager.createPacket(PacketType.Play.Server.ANIMATION, false);

        // [url]http://wiki.vg/Protocol#Animation[/url]
        animation.getEntityModifier(sleeping.getWorld()).
            write(0, sleeping);
        animation.getIntegers().
            write(1, 2);

        broadcastNearby(sleeping, animation);
    }

    private void broadcastNearby(Player asleep, PacketContainer bedPacket) {
        for (Player observer : plugin.manager.getEntityTrackers(asleep)) {
            try {
                plugin.manager.sendServerPacket(observer, bedPacket);
            } catch (InvocationTargetException e) {
                throw new RuntimeException("Cannot send packet.", e);
            }
        }
    }