Just an age. I guess it depends on the lifestyle. And how much you slow down . then it comes outta know where and hits you like a ton of bricks.
I went to work 7-3Saturday morning, stayed up during the,day. Went back to work Saturday night at 11pm got off at 3pm Sunday. My son's bday! Stayed up until 1 am monday morning. Going to the gym soon. I work 11-7 this week or 11-11 won't go back to sleep until tomorrow somwtime..