Add dynamic widget areas depending on the page

functions.php

register_sidebar( array(
	'name' => __( 'Homepage Widget area', 'twentyeleven' ),
	'id' => 'sidebarhp_widget_area',
	'description' => __( 'An optional widget area that appears only on your homepage', 'twentyeleven' ),
	'before_widget' => '<aside id="%1$s" class="widget %2$s">',
	'after_widget' => "</aside>",
	'before_title' => '<h3 class="widget-title">',
	'after_title' => '</h3>',
) );

register_sidebar( array(
	'name' => __( 'Category widget area', 'twentyeleven' ),
	'id' => 'sidebarcategory_widget_area',
	'description' => __( 'An optional widget that appears only on category pages', 'twentyeleven' ),
	'before_widget' => '<aside id="%1$s" class="widget %2$s">',
	'after_widget' => "</aside>",
	'before_title' => '<h3 class="widget-title">',
	'after_title' => '</h3>',
) );

sidebar.php

<?php 

	// This widget area will appear on the homepage only
	if ( is_active_sidebar( 'sidebarhp_widget_area' ) && is_home() ) : ?>
			<div id="sidebarhp" class="widget-area">
				<ul>
					<?php dynamic_sidebar( 'sidebarhp_widget_area' ); ?>
				</ul>
			</div>
	<?php endif;

	// This widget area will appear on the category pages 
	if ( is_active_sidebar( 'sidebarcategory_widget_area' ) && is_category() ) : ?>
			<div id="sidebarhp" class="widget-area">
				<ul>
					<?php dynamic_sidebar( 'sidebarcategory_widget_area' ); ?>
				</ul>
			</div>
	<?php endif;

?>

I couldn't get mine to work. I can't get the second widget to display in a certain post.

Here's my code:

<?php  
//for rest of posts
if (is_active_sidebar('blog_widget_area') ) : ?>
    <div id="secondary" class="blog_widget_area bordered" role="complementary">
        <?php dynamic_sidebar( 'blog_widget_area' ); ?>

    </div><!-- #secondary .widget-area -->
<?php endif;

//for specific post "Loyalty Program Trends in the Restaurant Industry"
if (is_active_sidebar('loyalty_programs_widget_area') && is_single('4063') ) : ?>
        <div id="secondary" class="blog_widget_area bordered" role="complementary">
        <?php dynamic_sidebar( 'loyalty_programs_widget_area' ); ?>
        </div>      
<?php endif;

?>