If an apartment has a rule which does not allow children to play outside during the day because other tenants are sleeping, this rule is illegal. The law states that it is a common known fact that children make noise and that adults have to put up with the noise children make as long as the children are not being unreasonably loud. Sometimes, children can be too loud. For example, if children are running around an apartment complex at midnight playing hide and go seek and screaming, then it would be reasonable to ask them to be quiet. However, rules which generally state that children must be quiet during the daylight hours are illegal.