what a shame they are waking your child up. Most people are pretty reasonable if you approach them and ask them for their help If you tell them what time your child is sleeping and ask them to knock it off during those times I'm sure they would be ok with it.... I know it might go against your grain but maybe approach them, appologise for loosing it and explain how much of a hard time you are having with a cranky child. Appeal to their sense of decent human nature and I'm sure you will find a happy medium. I think they do have a right to play basket ball though unless they are actually damaging your property.