Fight week takes a toll on 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 takes a toll on sleep. Fighters often hit the sack around 4 or 5 am but wake up between 2 and 4 am, leaving them restless