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

https://www.fightful.com/boxing/fight-week-the-sleep-problem-nobody-talks-about/

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.