My fourth baby had the same terrible broken night sleep pattern as the other three. After struggling for eight months, she did start to settle down, waking perhaps once a night.  This was great until I started her, at 10 months on bread. She immediately returned to night waking - for no apparent reason- and also had a clear runny nose.  I found that the bread had preservative 282 in it so we stopped feeding it to her. Within a couple of nights (I guess it had accumulated in her system) she again settled down to a peaceful nights' sleep! AND her nose cleared up! I can't believe that it could have been that simple!