apparently it's better to have a consistently bad sleep schedule than an inconsistently good one. Like if you stay up somewhat late on the weekdays for homework and sleep in on weekends, it's actually worse for you than just getting 5 hours of sleep at the same time every day. If want some proof, look at Eiichiro Oda, he goes to bed at 2:00 AM and wakes up at 5:00 AM every day to grind on making a chapter a week for One Piece at over 50 years old and the last time he had to get hospitalized was in 2013