DJs and producers often find themselves locked into a 4 AM body clock,...

https://bizzmarkblog.com/is-it-worth-paying-for-a-hotel-night-to-avoid-the-red-eye-after-a-gig/

DJs and producers often find themselves locked into a 4 AM body clock, performing when most people sleep. One track ends at 4:12 AM; the next starts before sunrise