DJs and producers know the 4 AM body clock all too well—like playing their last...
https://victor-wiki.win/index.php/What_Are_the_First_Signs_of_Burnout_for_a_Touring_DJ%3F
DJs and producers know the 4 AM body clock all too well—like playing their last set at 4:12 AM before rushing to catch a 9 AM flight