Sleep really late on weekends? You could be living with 'sleep bulimia'.
You've probably heard of bulimia as an eating disorder, and while most people would not compare it to sleep, sleep bulimia is a very real thing. Think about it, bulimia is all about binging and purging. For eating disorders, people will binge eat and then purge, which is a serious problem. While an entirely different condition, sleep bulimia is based on the same concept.
Sleep bulimics will "purge" sleep during the week, as they likely are getting work done, keeping themselves busy, and have to wake up early in the morning. This drowns people when they are not getting enough sleep. Then, on the weekends, they will "binge sleep" and wake up very late, sometimes even into the afternoons.
Some people reason that if you add up all the sleep from the week and weekends, it evens out to be approximately the amount of sleep they should be getting. However, that is not how our sleep health works. You need to be getting a full night's sleep as often as possible, and the regularity with which you get this amount of sleep is important.
So, we know that school, work, and life in general take a lot of work, but you'll be able to face them better with a full night's sleep. Spare yourself the troubles that all-nighters cause, and try to even out your schedule. That doesn't mean you can't sleep in a little on the weekends, but don't make the difference between week and weekend sleep more than a couple hours.