24 Hour Fitness not always open 24 hours

I didn't realize this at first but I joined 24 Hour Fitness thinking they are all open 24 hours. Some are not. This could have been a huge issue for me as I work shift work and sometimes work out in the early morning like at 2am depending on my schedule. Good thing there are 2 24 Hour Fitness locations fairly close to me as one of them is not open 24 hours. I would have been pretty angry if I couldn't work out when I wanted.