DJs and producers know the 4 AM body clock all too well—like arriving at a 9 AM...

https://wiki-view.win/index.php/Does_Chronic_Sleep_Loss_Change_Your_Mood_Even_If_You_Think_You%27re_Fine%3F

DJs and producers know the 4 AM body clock all too well—like arriving at a 9 AM flight after an overnight set