Smart dimensions for bedroom alcove shelves range from ten to twelve inches deep, perfect for storing books or displaying decor without crowding the space. This shallow depth fits most typical bedroom alcove widths between twenty-eight and forty-eight inches, allowing shelves to look intentional and not improvised. Keeping shelves this size maintains good walkway clearance and prevents a cramped feeling. Pair these shelves with warm accent lighting to highlight the nook and create a cozy atmosphere that's both stylish and functional.