My daughter, now an adult, never slept through the night and had frequent bouts of unsettling behaviour until somebdy told me about artificial coal tar based food colouring and i removed them from her diet.Then it was in lots of products..fish finger coating, squash, crisps sweets etc. After changes in legislation coal tar based colouring was removed from most products. i was surprised today to see a warning on a packet of candy canes that they contained products that ' could cause an adverse affect on activity and attention in children' I also saw the warning on the sweet necklaces...i nearly bought these for the grandchildren!