My sister & I used to make it an annual event until I had babies!

We would go at about 10pm and come home around 1-2am I think. It was always really busy when we first got there and would quieten down around the time we left. We just did it cos it was fun and we could!

But having said that, I am the type to do things like that, the kmart near my parents house used to be open 24 hrs so we'd just go there at midnight if we were bored!