Is it normal for a husband to go out clubbing with friends and coming home drunk at late hours?

If a husband and father of two small kids, sometimes goes out clubbing with friends and comes home drunk at late hours or doesn't come till the following day is this normal?

He's in his 30's but apparently is reverting back to doing those behavior as when he was younger and single. Is this normal?

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and he's late on a couple of bills
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He used to be a party guy in his younger years. He was both a great student with a high GPA (in fact he skipped two grades so he graduated from HS at age 16) and still went to parties. He would sometimes come late to classes because he already knew the lecture.
These changes started happening 4 years after our 2nd child (who is now 5 years old) was born. He's reverting back to his partying ways. I'm going to have a serious talk with him. This is the 5th time this happened this month.
Is it normal for a husband to go out clubbing with friends and coming home drunk at late hours?
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