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

https://wiki-mixer.win/index.php/Best_Nap_Timing_During_Fight_Week_Without_Ruining_Bedtime

Fight week is tough on sleep. Fighters often hit the sack around 4 or 5 am, waking up hours later before weigh-ins Friday morning. Long hours in the locker room and early event doors at 6 pm only add to the challenge