Children can be put on solids as early as 6 weeks. IT should not be added to the bottle however, as the baby can inhale tiny pieces of cereal leading to chest infectoins. They breathe differently while they are drinking to adults. Start with something like rice cereal made with breast milk and no more than half a teaspoon. If baby cannot use her tongue to push the food into her throat, she is too young. As a rule, I agree Lady SuGa, it doens't help with a good night's sleep...unless baby is affected by colic&/reflux. Then the solids can help babys gut feel a little more omcfortable by providing a non fatty source of food.
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