Your Class Time Is the Same as Your Nap Time
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There's no way that you are learning anything if you are unconscious during every class. Fall asleep in too many classes, and you'll find that it will be nearly impossible to catch up. If the class is so boring that you are falling asleep during each session, you probably aren't going to want to catch up on all of that reading and the lectures, anyway. You might want to just withdraw from the class when you can, so you can really catch up on your sleep.
Your Grade is a F-
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If you are so behind in the class that you have no idea of what the professor is talking about, and you can't even find your syllabus, you might want to think about withdrawing. I'm all for hanging in there, but let's be realistic. Maybe you are just not interested in the class enough to put in the amount of work that you'll need to do to get a decent grade. If you want to keep your GPA up and excel in the class, it might be better to try taking the class at another time when you can have a fresh start.
Clueless About the Class
Dunno Idk GIF by buzzfeedladylike - Find & Share on GIPHYGiphyIf you are so completely clueless that you do not have the slightest idea of what the class is about it's necessary to withdraw. Maybe you had a completely different idea of the class' topic. Especially if this class in not in your major, you should consider letting it go. If this class is required in your major, you will need to do some major studying to catch up.. You might even consider changing your major. It's one thing to be behind in your studies, but it's another thing to be so lost that you do not even understand the subject area of the class.
Personality Clash
Interrupting Darkest Hour GIF - Find & Share on GIPHYGiphyIt's always best to learn how to interact with diverse people, but if you simply can't bear your instructor or professor your grades in the class might suffer, You should be able to get over any irksome behavior (real or imagined) but if you can't stand listening to what your professor has to say, you probably will find it hard to learn from him or her. You might be better off withdrawing and attempting the class with a professor whom you can tolerate.