Best way would be to buy proper window coverings that would provide shade and limit sunlight to let your kids sleep well. Check venetian blinds as one of the most popular solutions for many rooms. Blinds made from natural wood, bamboo or artificial aluminium and PVC will be an ideal solution to darken the room. Their sunlight control system makes them an ideal solution for children’s rooms. Remember, venetian blinds are not full blackout products. If you’re looking for the blackout ones, check other product groups like roman blinds or roller blinds with a full blackout option.