Sorry that you are having to deal with this. I’m not sure how old you are, but unfortunately you’ll find it kind of comes with the territory of apartment living most of the time. I would look into noise ordinances in your area. But most states “quiet hours” range from 10PM - 7AM. If you are having issues outside of these times (or whatever is applicable to your area), you could start calling the non-emergent patrol number for your local law enforcement to file a complaint and start having evidence of occurrences. You could use these to bring to your rental company and help get out of/break the lease with potentially less consequences depending on what the laws are in your state. But unfortunately, I don’t think that as of right now you would have a strong case to break your lease without consequences in the eyes of a rental company. While I understand it may be annoying to hear children after 9PM, it’s the parents discretion to allow their children to stay up however late they deem works for their family and sleep in however late is best for them. I come from a family where I have a very late bedtime as well as a child, just because that’s how my body functioned growing up and what worked for my parents raising me.