Fight week is brutal for sleep. Fighters often hit the sack around 4 or 5 am,...

https://varimail.com/articles/what-does-a-schedule-built-to-destroy-sleep-look-like-in-fight-week/

Fight week is brutal for sleep. Fighters often hit the sack around 4 or 5 am, wake up at 2 or 4 am, then spend six hours cramped in the locker room before Friday morning’s weigh-ins. That’s a tough cycle to break before stepping into the ring.