DJs and producers know the 4 AM body clock all too well—like when the set ends...

https://list-wiki.win/index.php/What_Touring_DJs_Learned_About_Sleep_in_the_Last_Five_Years

DJs and producers know the 4 AM body clock all too well—like when the set ends precisely at 4:12 AM, and the journey back means sunglasses in daylight