It really depends on the person, but in my case, yes, it comes and goes. I mean,
I'm always more tired than a healthy person, but there are weeks where I need to sleep 20 hours a day and other weeks where I can get by with 8-10 hours a day.
I find that the best way to deal with this is to make sure I have enough time for emergency naps once in awhile. I've also learned to become very efficiant in what I do. I find that if I manage to get everything done quickly, it doesn't matter if I have to sleep a lot more later on.