Fight week throws athletes into a tough sleep cycle. Early weigh-ins Friday...

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

Fight week throws athletes into a tough sleep cycle. Early weigh-ins Friday morning and locker rooms open at 6 PM mean fighters often get to bed around 4 or 5 AM. Waking between 2 and 4 AM throws off rest just when focus is key