Sleeping bag for children, having a main part including a collar and a bottom part, which during use of the sleeping bag for children, forms at least one part of its lying area, and where, along its lower edge, is fastened one part of a zipper for connection with a detachable supplementary part or a cover. The sleeping bag has at least two supplementary parts, of which one is generally shaped as a cover over the bottom part of the main part, and one is formed with a bag-forming part which forms an extending cover-shaped tongue.