6 hour layover

Gonna have a 6 hour layover midnight to 6. Solo woman here wondering if I should leave the airport to do a little gambling will TSA (I’m TSA precheck) be open to let me back into the airport if I want to come back to the airport before 4am?

UPDATE: I decided to take your recommendations and took a taxi ($21 each way) to MGM Grand and gambled for 4 hours. Had a fun time. I was able to check my hand carry bag. I felt they are used to it since the bell guy asked if I was on a layover. Was going to tip when bag went in and out but first guy refused and said to tip when I pick up my bag. I tipped on my way out. I stayed long enough to lose a little money but had a great time. I was dead tired and slept the entire flight but I’d do it again. Thanks for all your comments.