Would you report this or mind your own buisness?

I live in a duplex and my apartment is the end unit which is next the garage that belongs to the people in the apartment on the other end. Every night at about 2-3:00 am Im awakened by the noise they are making in the garage - whether its someone knocking on the garage door or them scuffling around. Its about 10 degrees outside at that time of night. I have suspicion that they are using drugs (Im not the kinda person who is suspicious of everyone) and so does everyone else who knows whats going. They have 2 small kids that are left in the apartment by themselves and I have 2 kids that are in the room next to the garage. Im not only worried about their kids but mine as well. Should I call the police next time they are in the garage at that time and call CPS or mind my own buisness?