Follow-Up: Check out narcolepsy. Sometimes it suddenly appears, mainly as a result of unusual stress, sometimes for no reason that anyone can identify. If you have some of the symptoms (the major one being very very very vivid dreams), you should be examed and treated. I know what you're going tho, you have to be awake for classes, yet you're falling asleep, and you're stressed, and you get sleepier and further behind, and more stressed, and sleepier, and it's a vicious circle. Let us know how you do!