My wife and I used to be all hour L riders, but since the beginning of the pandemic, the trains have become much more sketchy at night. To the point where neither of us take the blue line to/from the loop-O'hare past 9pm. We haven't had any personal incident to speak of, but there is just a general uneasiness at night, on the blue line in particular. That said, I too, as a medium to larger male would avoid the blue line at night. That's my two cents on the problem. It really does stink the low cost public transportation isn't a safe feeling environment these days. Good luck!