Children sleep sooner and better if light curtains are lined with thin black cotton material at about 40 cents a yard. The linings may hang loose to make washing easier. Or, if the window is suitable, a piece of the black material can be cut the same shape and size as the window; hem the edges and stitch a curtain' ring at each upper corner. Then fix a cup hook at each upper corner of the window, and the dark blind can be put up when the children go to bed and taken down in the morning. Either way, light but not air is excluded.
Text read from the printed page and cleaned; old type leaves the occasional error.